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JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH . Vol. 18, N° 1Mention de date : 01/2021Paru le : 23/03/2021 |
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Ajouter le résultat dans votre panierPost-anodization methods for improved anticorrosion properties : a review / Telmenbayar Lkhagvaa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Post-anodization methods for improved anticorrosion properties : a review Type de document : texte imprimé Auteurs : Telmenbayar Lkhagvaa, Auteur ; Zeeshan Ur Rehman, Auteur ; Dongjin Choi, Auteur Année de publication : 2021 Article en page(s) : p. 1–17 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion
Couches minces
Métaux -- Oxydation anodique
Microstructures
Revêtement métallique
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Anodization is a prominent surface treatment for light alloys that has been successfully used in the industry for the last two decades as it provides effective corrosion and wear protection. However, anodic films have porous structures, and the period of corrosion protection is limited by the nature of anodic pores, through which corrosive species may enter and reach the substrate surface. To seal the anodic porous layer, various post-anodization treatments have been developed. The most commonly employed post-treatments are the layered double hydroxide (LDH), sol–gel, hydrothermal, and cerium-based methods. Recent research revealed that after applying these post-treatments to various anodized magnesium alloys, the corrosion resistance of the resulting coatings is sufficiently enhanced because the post-layers seal the pores in the anodic thin films. This article reviews the recent research progress regarding post-anodization coatings formed on anodized magnesium alloys. Furthermore, the corrosion protection performance and microstructural changes of the resulting coatings are elucidated. The LDH method was found to be the most beneficial sealing treatment, as the treated anodized specimens demonstrated excellent corrosion resistance and a significant self-healing effect. In contrast, less satisfactory protection properties were obtained using the sol–gel, hydrothermal, and cerium-based sealing methods. Note de contenu : - POST-TREATMENT METHODS FOR ANODIZED THIN FILMS : Layered double hydroxide (LDH) method - Sol-gel method - Hydrothermal method - Cerium-based method
- POST-TREATMENT EFFECT ON COMPOSITION AND MICROSTRUCTURE OF ANODIZED MAGNESIUM ALLOY THIN FILM : LDH post-treatment - Sol-gel post treatment - Hydrothermal post-treatment - Cerium post-treatment
- POST-TREATMENT EFFECT ON CORROSION RESISTANCE OF THE ANODIZED MAGNESIUM ALLOY THIN FILM : Layered double hydroxides - Sol-gel method - Hydrothermal treatment - Cerium-based sealing treatment
- Table 1 : Summary of post-anodization coating procedures and corrosio performance of the resulting coatingsDOI : https://doi.org/10.1007/s11998-020-00367-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00367-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35347
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible A review of microencapsulated thermochromic coatings for sustainable building applications / Pritish Shivanand Aklujkar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : A review of microencapsulated thermochromic coatings for sustainable building applications Type de document : texte imprimé Auteurs : Pritish Shivanand Aklujkar, Auteur ; Balasubramanian Kandasubramanian, Auteur Année de publication : 2021 Article en page(s) : p. 19-37 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants
Construction -- Matériaux
Développement durable
Encapsulation
Polymérisation interfaciale
Revêtements organiques
ThermochromieIndex. décimale : 667.9 Revêtements et enduits Résumé : The review covers microencapsulation methods for encapsulating thermochromic leuco dyes, and the incorporation of these microencapsulated thermochromic dyes in smart coatings has been developed, which helps in creating sustainable buildings that use less power for heating and cooling applications. The thermochromic mechanism of leuco dye developer–solvent systems has been elaborated, and the role of each component for the functioning of thermochromic dyes is discussed. The future scope of these dyes in applications involving smart windows and smart coatings for sustainable buildings is consolidated, and their impact on energy consumption has been studied. Note de contenu : - THERMOCHROMIC LEUCO DYE : COMPOSITION AND MECHANISM : Composition of the thermochromic system - Mechanism of thermochromic dyes
- MICROENCAPSULATION OF THE THERMOCHROMIC LEUCO DYES : Interfacial polymerization - Coacervation - Microencapsulating thermochromic dyes with microPCMs
- THERMOCHROMIC COATINGS : APPLICATIONS IN CONSTRUCTION : Thermochromic coating formulation
- THERMOCHROMIC SMART WINDOW
- Table 1 : Classification of significant types of chromism
- Table 2 : Division of the thermochromic systems based on inherent and doped systemsDOI : https://doi.org/10.1007/s11998-020-00396-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00396-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35348
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Durability of vitreous enamel coatings and their resistance to abrasion, chemicals, and corrosion : a review / Stefano Rossi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Durability of vitreous enamel coatings and their resistance to abrasion, chemicals, and corrosion : a review Type de document : texte imprimé Auteurs : Stefano Rossi, Auteur ; Francesca Russo, Auteur ; Massimo Calovi, Auteur Année de publication : 2021 Article en page(s) : p. 39-52 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion
Durée de vie (Ingénierie)
Emaux
Résistance à l'abrasion
Résistance chimique
Revêtement émailIndex. décimale : 667.9 Revêtements et enduits Résumé : Vitreous enamels represent a class of coatings with different technological properties, mainly appreciated for the protection they guarantee to the covered substrates. This review introduces enamel coatings, describing their production technologies and presenting the main properties affecting the enamel’s durability. Firstly, this review article introduces the most important studies regarding the improvement in abrasion resistance, highlighting both successes and failures. Afterward, the work reveals an outlook about the resistance to chemicals, underlining the good resistance of enamels toward acidic chemicals and discussing the results of studies aimed to improve their performances toward alkaline solutions. This review also considers the corrosion protection property of enamels, highlighting the high barrier effect they provide against the absorption of aggressive substances toward metal substrates. Finally, new perspectives and possible future research paths are presented, being aware that this kind of coating offers both good product protection and functional integrity over time. Note de contenu : - ENAMEL PROPERTIES AFFECTING DURABILITY : Resistance to abrasion - Resistance to chemicals - Corrosion protection properties DOI : https://doi.org/10.1007/s11998-020-00415-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00415-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35349
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Porous silicon-modified electrode for electrochemical pesticide biosensor / Maha Ayat in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Porous silicon-modified electrode for electrochemical pesticide biosensor Type de document : texte imprimé Auteurs : Maha Ayat, Auteur ; Katia Ayouz, Auteur ; Chafiaa Yaddadene, Auteur ; Malika Berouaken, Auteur ; Noureddine Gabouze, Auteur Année de publication : 2021 Article en page(s) : p. 53-63 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biocapteurs
Caractérisation
Electrochimie
EnzymesUne enzyme est une protéine dotée de propriétés catalytiques. Pratiquement toutes les biomolécules capables de catalyser des réactions chimiques dans les cellules sont des enzymes ; certaines biomolécules catalytiques sont cependant constituées d'ARN et sont donc distinctes des enzymes : ce sont les ribozymes.
Une enzyme agit en abaissant l'énergie d'activation d'une réaction chimique, ce qui accroît la vitesse de réaction. L'enzyme n'est pas modifiée au cours de la réaction. Les molécules initiales sont les substrats de l'enzyme, et les molécules formées à partir de ces substrats sont les produits de la réaction. Presque tous les processus métaboliques de la cellule ont besoin d'enzymes pour se dérouler à une vitesse suffisante pour maintenir la vie. Les enzymes catalysent plus de 5 000 réactions chimiques différentes2. L'ensemble des enzymes d'une cellule détermine les voies métaboliques qui peuvent avoir lieu dans cette cellule. L'étude des enzymes est appelée enzymologie.
Les enzymes permettent à des réactions de se produire des millions de fois plus vite qu'en leur absence. Un exemple extrême est l'orotidine-5'-phosphate décarboxylase, qui catalyse en quelques millisecondes une réaction qui prendrait, en son absence, plusieurs millions d'années3,4. Comme tous les catalyseurs, les enzymes ne sont pas modifiées au cours des réactions qu'elles catalysent, et ne modifient pas l'équilibre chimique entre substrats et produits. Les enzymes diffèrent en revanche de la plupart des autres types de catalyseurs par leur très grande spécificité. Cette spécificité découle de leur structure tridimensionnelle. De plus, l'activité d'une enzyme est modulée par diverses autres molécules : un inhibiteur enzymatique est une molécule qui ralentit l'activité d'une enzyme, tandis qu'un activateur de cette enzyme l'accélère ; de nombreux médicaments et poisons sont des inhibiteurs enzymatiques. Par ailleurs, l'activité d'une enzyme décroît rapidement en dehors de sa température et de son pH optimums.
HydrosilylationLa réaction d'hydrosilylation consiste en l'addition d'une fonction hydrogénosilane (Si-H) sur un composé organique insaturé.
Il existe principalement deux méthodes pour mettre en œuvre cette réaction :
La génération de radicaux silyle : thermiquement (300 °C), par irradiation (rayonnement ultraviolet ou par décomposition de peroxydes ou d'azonitriles.
La catalyse par des métaux de transition généralement du groupe VIII. Parmi ces différents catalyseurs employés pour la réaction d'hydrosilylation, les composés à base de platine et plus particulièrement l'acide hexachloroplatinique hexahydraté sont ceux qui présentent la plus grande efficacité1. Ce catalyseur utilisé en très faible quantité et pour des temps de réaction généralement inférieurs à 5 h permet d'atteindre des rendements relativement élevés.
Un mécanisme plus récent de l'hydrosilylation a été proposé dans la thèse de Patrick Cancouët sur un polysiloxane porteur de fonction hydrogénosilanes latérales.
Matériaux poreux
PesticidesUn pesticide est une substance répandue sur une culture pour lutter contre des organismes considérés comme nuisibles. C'est un terme générique qui rassemble les insecticides, les fongicides, les herbicides, les parasiticides.
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
Surfaces fonctionnellesIndex. décimale : 667.9 Revêtements et enduits Résumé : An electrochemical biosensor for organophosphorus pesticides detection has been developed by immobilizing acetylcholinesterase (AChE) enzyme, through a multi-step functionalization process, on porous silicon (PSi) surface. The PSi surface was functionalized using thermal hydrosilylation creating acidic chains to stabilize the surface. The AChE was covalently attached on the PSi surface and exhibited a good enzyme activity in the presence of its substrate acetylthiocholine iodide (ATI) by forming thiocholine. The response of the device shows a linear evolution over a wide concentration range of ATI from 0.15 to 0.65 mM with a good correlation coefficient. Furthermore, AChE revealed high affinity to its substrate ATI from calculated Michaelis–Menten constant (Km), which is about 0.249 mM. The effect of the organophosphorus pesticide malathion was monitored by measuring the current oxidation in ATI solution. After incubation, it shows a drastic decrease in the electrochemical response in the presence of the pesticide at different concentrations (2–8 nM). Note de contenu : - EXPERIMENTAL : Materials - Preparation of porous silicon - Functionalization of PSI
- CHARACTERIZATIONS : Scanning electron microscopy (SEM) characterization - FTIR characterization - Contact angle measurement - Cyclic voltammetry
- RESULTS AND DISCUSSION : SEM observation of the electrode - FTIR characterization - Contact angle measurement - Cyclic voltammetry studyDOI : https://doi.org/10.1007/s11998-020-00381-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00381-w.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35350
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Facile preparation of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/a, w-dihydroxy-terminated poly(dimethylsiloxane) composite rubber : application to effective removal of fluorinated aromatic compound from aqueous methanol solution by fluoroalkylated silicone composite rubber / Katsumi Yamashita in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Facile preparation of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/a, w-dihydroxy-terminated poly(dimethylsiloxane) composite rubber : application to effective removal of fluorinated aromatic compound from aqueous methanol solution by fluoroalkylated silicone composite rubber Type de document : texte imprimé Auteurs : Katsumi Yamashita, Auteur ; Taiga Yokouchi, Auteur ; Hideo Sawada, Auteur Année de publication : 2021 Article en page(s) : p. 63-73 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption
Caoutchouc
Composés aromatiques
Composites polymères
Fluoropolymères
Oligomères
Polyalkoxysiloxane
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.Index. décimale : 667.9 Revêtements et enduits Résumé : Fluoroalkyl end-capped vinyltrimethoxysilane oligomer [RF-(CH2CHSiOMe)3)n-RF ; n = 2, 3; RF = CF(CF3)OC3F7 : RF-(VM)n-RF] undergoes the sol-gel reactions in the presence of α, ω-dihydroxy-terminated poly(dimethylsiloxane) [HO-(SiMe2O)nH : HPDMS] under non-catalytic conditions to provide the crosslinked RF-(VM)n-RF/HPDMS composite rubber in quantitative isolated yields. Especially, we can isolate the expected composite rubber through the sol-gel reactions, in which the contents of the RF-(VM)n-RF oligomer based on employed oligomer and HPDMS are greater than 0.16 %. In contrast, traditional silane coupling agents such as tetraethoxysilane, methyltrimethoxysilane and triethoxy-1H, 1H, 2H, 2H-tridecafluoro-n-octylsilane were unable to afford the expected composite rubber through the sol-gel reactions with HPDMS under similar conditions. The fluoroalkylated silicone composite rubber thus obtained gave no swelling behavior toward water, dimethyl sulfoxide and methanol ; however, the composite rubber was found to display the higher swelling characteristic for toluene, hexane and tetrahydrofuran, especially for fluorinated aliphatic solvents. Interestingly, it was demonstrated that the fluoroalkylated silicone composite rubber swollen with hexane can adsorb a variety of aromatic compounds in aqueous methanol solutions. More interestingly, we found that the fluoroalkylated silicone composite rubber can exhibit an excellent adsorption ability toward the fluorinated aromatic compounds such as 2', 3', 4', 5', 6'-pentafluoroacetophenone, compared to that of the corresponding non-fluorinated one. Note de contenu : - EXPERIMENTAL : Measurements - Materials - Preparation of fluoroalkyl end-caped vinyltrimethoxisylane oligomer/α, ω-dihydroxy-terminated poly(dimethylsiloxane) composite [Rf-(VM)n-Rf/HPDMS] rubber - Preparation of modified glass treated with the Rf-(VM)n-Rf/HPDMS composite rubber - Evaluation of swelling behavior of the fluoroaklylated silicone composite rubber soaked in a variety of solvents - Adsorption of aromatic compound in aqueous methanol solution by the Rf-(VM)n-Rf/HPDMS DOI : https://doi.org/10.1007/s11998-020-00382-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00382-9-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35351
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Dimensional analysis of droplet size and ligament length during high-speed rotaryh bell atomization / Lutz Gödeke in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Dimensional analysis of droplet size and ligament length during high-speed rotaryh bell atomization Type de document : texte imprimé Auteurs : Lutz Gödeke, Auteur ; Walter Oswald, Auteur ; Norbert Willenbacher, Auteur ; Peter Ehrhard, Auteur Année de publication : 2021 Article en page(s) : p. 75-81 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse dimensionnelle
Atomisation
Dépôt par pulvérisation
Désintégration
Epaississants
Polyacryliques
Taille des gouttelettesIndex. décimale : 667.9 Revêtements et enduits Résumé : Modern spray-coating processes are based on high-volume, low-pressure, airless atomization or high-speed rotary bell atomization, often assisted by electrostatic charging to increase the transfer efficiency. The process from the liquid film flow beneath the bell, through ligament formation and consecutive disintegration to droplet deposition, has been constantly explored during the evolution of automotive spray coating. This work proposes a set of dimensionless groups that fully describe the process from film flow to ligament disintegration, including shear and elongational flow effects during atomization of particle laden, shear thinning, viscoelastic fluids. Note de contenu : - General process description and dimensional analysis
- Table 1 : Liquid properties for the different mixtures S1-S5 of sterocoll SHT and SXT used in the experimental setupDOI : https://doi.org/10.1007/s11998-020-00389-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00389-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35352
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Amphiphilically modified self-stratified siloxane-glycidyl carbamate coatings for anti-icing applications / AliReza Rahimi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Amphiphilically modified self-stratified siloxane-glycidyl carbamate coatings for anti-icing applications Type de document : texte imprimé Auteurs : AliReza Rahimi, Auteur ; Morgan Murphy, Auteur ; Vinod Upadhyay, Auteur ; Kinza Faiyaz, Auteur ; Dante Battocchi, Auteur ; Dean C. Webster, Auteur Année de publication : 2021 Article en page(s) : p. 83-97 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Carbamate de glycidyle
Epoxydes
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.
Polyéthylène glycol
Polymères amphiphiles
Polyuréthanes
Revêtements antigel
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Icephobic coatings have applications in many industries to protect surfaces from deterioration and avoid catastrophic incidents. In this work, we report a new strategy to prepare amphiphilic siloxane-glycidyl carbamate coatings (AmpSiGC) coatings with anti-icing property. Polydimethyl siloxane (PDMS) and poly(ethylene glycol) (PEG) provided amphiphilicity for the AmpSiGC coatings. The designed experiment considered several factors: molecular weight of the surface-modifying polymers and their amount in the coating system. Although amphiphilic coatings have demonstrated promising results as marine coatings, investigations on their icephobic applications have been limited. This work discusses three aspects of the developed AmpSiGC systems: (1) preparation of the incorporated ingredients and their characterization by Fourier transform infrared spectroscopy (FTIR); (2) surface characterization of coatings via ATR (attenuated total reflectance)-FTIR, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM); and (3) ice-adhesion, electrochemical impedance spectroscopy (EIS), and mechanical property evaluations. Overall, the surface analysis indicated the presence of both hydrophobic and hydrophilic domains and most of the coatings demonstrated promising performance for anti-icing applications with desirable barrier and mechanical properties in comparison to controls. Note de contenu : - EXPERIMENTAL : Design of experiments - Materials - Synthesis of glycidyl carbamate resin - Epoxy equivalent weight titrations - Percent solids determination - Fourier transform infrared spectroscopy - Coating formulaton & curing - Icephobic characterization - Statistical analysis - Surface characterization - Water absorption and barrier performance - Mechanical tests
- RESULTS AND DISCUSSION : GC resin and prepolymers - Contact angle - Ice adhesion - XPS - ATR-FTIR - AFM images - Water absorption and barrier properties - Mechanical properties
- Table 1 : Coating compositions
- Table 2 : Epoxy equivalent weight for GC resin and some prepolymersDOI : https://doi.org/10.1007/s11998-020-00402-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00402-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35353
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Photoreactivity study of photoinitiated free radical polymerization using Type II photoinitiator containing thioxanthone initiator as a hydrogen acceptor and various amine-type co-initiators as hydrogen donors / Yung-Chung Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Photoreactivity study of photoinitiated free radical polymerization using Type II photoinitiator containing thioxanthone initiator as a hydrogen acceptor and various amine-type co-initiators as hydrogen donors Type de document : texte imprimé Auteurs : Yung-Chung Chen, Auteur ; Ting-Yu Liu, Auteur ; Yan-Heng Li, Auteur Année de publication : 2021 Article en page(s) : p. 99-106 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accepteurs d'hydrogène
AminesUne amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels.
On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués.
Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3.
Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire.
D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel.
Photoamorceurs (chimie)
Photoréticulation
ThioxanthoneLe thioxanthone est un composé hétérocyclique qui est un soufre analogue du xanthone. Le
Thioxanthone peut être synthétisé par réaction de sulfure de diphényle avec du phosgène en présence de catalyseur de chlorure d'aluminium . Cette synthèse peut être considérée comme un cas particulier de l'acylation de Friedel-Crafts . Le produit de réduction est le thioxanthène.
Triméthacrylate de triméthylolpropaneFormule moléculaire brute : C18H26O6 - Numéro CAS : 3290-92-4Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, free radical photopolymerization of trimethylolpropane trimethacrylate (TMPTMA) is initiated. We investigated the corresponding photoreactivity by using Type II photoinitiator (PI) systems based on thioxanthone (TX) as a hydrogen acceptor and five amine-type molecules, such as N-phenylglycine (NPG), triethylamine (TEA), triethanolamine (TEOA), 2,2′-(4-methylphenylimino)diethanol (p-TDEA), and N-phenyldiethanolamine (n-PDEA), as hydrogen donors. Their photochemical and photophysical properties are studied. The TX hydrogen acceptor displayed rather red-shifted compared to all the hydrogen donor compounds. The hydrogen donor compounds exhibited the absorption band at lower than 300 nm, which followed the trend of p-TDEA > n-PDEA > NPG > TEOA > TEA. All the packages exhibit good electron-transfer ability by the calculation of the free energy changes (ΔGET) through cyclic voltammetry (CV) measurement. However, the hydrogen donors with different steric hindrance, secondary, and tertiary amines have a decisive influence on the photoreactivity; that is, the TX/TEOA package shows the best double-bond conversion (DC) efficiency than other formulations under similar weight ratios (hydrogen acceptor: hydrogen donor = 1:2 wt%). We then conduct the photoreactivity based on TX/TEOA formulation with different weight ratios. The DC values are in the order of 1:2 wt% > 1.5:1.5 wt% > 2:1 wt%. Under suitable amount of hydrogen donor, the TX/TEOA-based formulation also exhibits stable DC value at air atmosphere. Note de contenu : - Materials
- Measurements
- Gel fraction
- Table : Photophysical properties and electrooptical parameters of the compoundsDOI : https://doi.org/10.1007/s11998-020-00401-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00401-9.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35354
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Effects of colloidal silica on the properties of POSS-containing fluorinated poly(styrene–acrylate)/SiO2 composite materials / Wenbo Liao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Effects of colloidal silica on the properties of POSS-containing fluorinated poly(styrene–acrylate)/SiO2 composite materials Type de document : texte imprimé Auteurs : Wenbo Liao, Auteur ; Liuyong Zou, Auteur ; Shaona Zheng, Auteur ; Lili Zhao, Auteur ; Xiangxuan Huang, Auteur ; Lingyun Ye, Auteur ; Guoyu Zhong, Auteur Année de publication : 2021 Article en page(s) : p. 107-116 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Colloides
Copolymère styrène acrylate
Copolymères greffés
Dioxyde de silicium
Hydrophobie
Revêtements organiques
Rugosité
Silsesquioxanes oligomères polyhèdres
Sol-gel, Procédé
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyhedral oligomeric silsesquioxane (POSS)-containing fluorinated poly(styrene–acrylate)/SiO2 (POSS-FPSA/SiO2) composite materials were prepared by preemulsification and direct blending method. The SiO2 particles were induced aggregated onto the surface of POSS, and sol–gel processes were simultaneously carried out with addition of co-solvent to form raspberry-like structure. 29Si NMR and XRD results confirmed that POSS were successfully grafted to polymer and were evenly dispersed uniformly in polymer matrix. The average diameter of composite latexes increased from 63 to 81 nm with increasing addition of SiO2 content. AFM and WCA images confirmed that sol–gel processes were promoted by increasing addition of SiO2 content, which improved the roughness and hydrophobicity of composite films. XPS spectra displayed that two kinds of Si–O bonds existed on the surface of composite films. One was related to the Si–O groups of SiO2, and the other was attributed to the Si–O–Si groups obtained from the sol–gel processes. The peak area of the former decreased from 56.86% to 38.78%, while the latter increased from 43.14% to 62.22%. TGA curves demonstrated that the composite film exhibited better thermal stability when the SiO2 content was 10.0%. In addition, serious phase separation would decrease the thermal stability of composite films. Note de contenu : - EXPERIMENTAL : Materials - Preparation of POSS-FPSA/SiO2 composite materials - Characterization
- RESULTS AND DISCUSSION : The preparation and structure of POSS-FPSA SiO2 composite materials - Effects SiO2 content on the properties of POSS-FPSA/SiO2 composite materials
- Scheme : The synthetic route of PSA, POSS-FPSA, and POSS-FPSA/SiO2DOI : https://doi.org/10.1007/s11998-020-00384-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00384-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35355
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible In situ preparation and properties of waterborne polyurethane/edge-isocyanated hexagonal boron nitride composite dispersions / Huixiang Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : In situ preparation and properties of waterborne polyurethane/edge-isocyanated hexagonal boron nitride composite dispersions Type de document : texte imprimé Auteurs : Huixiang Liu, Auteur ; Weiju Hao, Auteur ; Yixiu Qin, Auteur Année de publication : 2021 Article en page(s) : p. 117-127 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion
Caractérisation
Composites
Nanoparticules
Nitrure de boreLe nitrure de bore est un composé chimique du bore et de l'azote, de formule chimique brute BN (nombre égal d'atomes de chaque élément). Le nitrure de bore est isoélectronique avec le carbone et, comme ce dernier, existe sous plusieurs formes polymorphiques, dont l'une est analogue au diamant et l'autre au graphite. La forme diamant est l'un des matériaux les plus durs connus et la forme graphite est un lubrifiant apprécié. De plus, ces deux polymorphes possèdent des propriétés d'absorption radar.
Polymères en émulsion
Polymérisation
Polyuréthanes
Résistance à l'usure
Revêtements -- Propriétés mécaniques
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, a series of waterborne polyurethane (WPU) dispersions were prepared by in situ polymerization of edge-isocyanated hexagonal boron nitride (hBN-NCO) nanosheets suspension. The hBN-NCO nanosheets act as both cross linkers and nano-fillers in the composites, and meanwhile, the interfacial compatibility and dispersion of the inorganic nano-fillers in polymer substrates were also greatly improved. Therefore, the WPU films containing only 2 wt% hBN-NCO nanosheets exhibited remarkable mechanical strength and favorable wear resistance, and its stress and Young’s modulus increased by threefold and tenfold, respectively, as compared to those of pure WPU film. Moreover, its low corrosion current density (2.5 × 10−9 A cm−2) and high corrosion potential (0.79 V) enhanced the corrosion resistance of the WPU coating. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and chemicals - Synthesis of hBN-NCO - Preparation of WPU/hBN-NCO composites dispersion - Preparation of WPU/hBN-NCO composite films - Characterization
- RESULTS AND DISCUSSION : Characterizations of hBN-NCO - Characterization of WPU and WPU/hBN-NCO composite dispersions - Characterization of WPU and WPU/hBN-NCO composite films - Interface compatibility - Mechanical properties and wear resistance - Anti-corrosion performanceDOI : https://doi.org/10.1007/s11998-020-00385-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00385-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35356
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Specific crosslinking effects of poly(epichlorohydrin)-triol on urethane polymer matrix of castor seel oil-based coatings / T. O. Siyanbola in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Specific crosslinking effects of poly(epichlorohydrin)-triol on urethane polymer matrix of castor seel oil-based coatings Type de document : texte imprimé Auteurs : T. O. Siyanbola, Auteur ; R. Enishetty, Auteur ; R. Kumar, Auteur ; O. O. james, Auteur ; G. I. Olasehinde, Auteur ; S. Kaki, Auteur ; R. Nayaran, Auteur ; K. V. S. N. Raju, Auteur Année de publication : 2021 Article en page(s) : p. 129-141 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Adhésion
Antibactériens
Anticorrosion
Caractérisation
Huile de ricin et constituants
Hydrophobie
Métaux -- Revêtements protecteurs
Polyépichlorhydrine
Polyuréthanes
Résistance chimique
Revêtements -- Propriétés mécaniques
Revêtements organiques
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The contributions of castor seed oil (CSO) as a useful, nontoxic, and sustainable base material for coating systems cannot be overemphasized. This paper took advantage of the predominant fatty acid composition in CSO (i.e., ricinoleic acid). It blended a synthesized crosslinker, poly(epichlorohydrin-triol) (PECH-triol), in percentages within its polymeric matrix. Physicochemical and spectroscopic (FTIR, 1H-NMR, and 13C-NMR) examinations were carried out on the polyols. Thermal stability, hydrophobicity, anticorrosion, mechanical, and antibacterial properties of the prepared polyurethane (PU) coatings were examined. The 20% PECH-triol–CSO-PU film having its TON and TEND at 230.5 and 511.0°C, respectively, showed improved thermal stability when compared with the pristine film (CSO-PU). The derivative of TGA reveals a three-stage degradation step. Hydrophobicity was seen to increase from 73.3° to 92.2°, a reflection of the crosslinking effect of PECH-triol within the urethane matrix. The improved adhesion of 20% PECH-triol–CSO-PU coating on mild steel gave a better chemical resistance. Note de contenu : - EXPERIMENTAL : Materials - Preparation - Characterization
- RESULTS AND DISCUSSION : Physicochemical properties CSO and PECH-triol - Flow curve analysis and molecular weight of CSO and PECH-triol - Spectroscopic analyses of synthesized compounds - Thermal analysis of PU films - Contact angle - Electrochemical analysis - UTM analysis of coating films - Antimicrobial study of the films - Chemical resistance and drying behavior of coating films
- Table 1 : Physicochemical properties of CSO and PECH-triol
- Table 2 : Thermal behavior data of polyurethane films
- Table 3 : Corrosion parameters of coated and uncoated mild steel in 3.5% NaCl
- Table 4 : UTM analysis of polyurethane coating films
- Table 5 : Antimicrobial activities of pristine and blended polyurethanes
- Table 6 : Drying time and chemical resistance of resinsDOI : https://doi.org/10.1007/s11998-020-00387-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00387-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35357
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible DSC and TGA characterization of free and surface water of colloidal unimolecular polymer (CUP) particles for coatings applications / Peng Geng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : DSC and TGA characterization of free and surface water of colloidal unimolecular polymer (CUP) particles for coatings applications Type de document : texte imprimé Auteurs : Peng Geng, Auteur ; Sagar Vijay Gade, Auteur ; Michael Roy Van de Mark, Auteur Année de publication : 2021 Article en page(s) : p. 143-154 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Caractérisation
Densité
Eaux de surface
Formulation (Génie chimique)
Granulométrie
Poids moléculaires
Polymères -- Synthèse
Polymères unimoléculaires colloïdaux
Revêtements en phase aqueuse
Revêtements organiques
Rhéologie
Stabilité gel-dégel
Taille des particules
ThermogravimétrieIndex. décimale : 667.9 Revêtements et enduits Résumé : Colloidal unimolecular polymer (CUP) particles are spheroidal nano-scale and 3–9 nm that can be easily designed and controlled. The formation of CUP involves simple synthesis and water reduction. These nanoparticles have charged hydrophilic groups on the surface and are surrounded by a layer of surface water that does not freeze until very low temperature. CUPs have very high surface area per gram, which gives them a high nonfreezing water content. The CUP system is free of surfactant and has zero VOC, exhibiting great potential for coatings applications. The amount and thickness of the surface water were determined by differential scanning calorimetry (DSC) using the heat of fusion. The solution density and knowledge of the resin density and the composition of the CUP solution were used to determine the density of surface water. The evaporation rate of free water and surface water in CUP solutions were investigated by thermogravimetric analysis (TGA) and showed the effect of CUP on the evaporation rate. CUP as an additive to give freeze thaw stability, wet edge retention and open time improvements were explored. Excellent performance in freeze thaw, wet edge time improvement and more open time was found. The CUP system offers an excellent alternative to form zero VOC waterborne coatings. Note de contenu : - EXPERIMENTAL : Polymer synthesis - Absolute molecular weight of copolymers - Density of dry CUPs - Density of CUP solutions - Acid number (AN) - Viscosity of CUP solutions - Particle size of CUP - Differential scanning calorimetry - Paint formulation - Freeze thaw stability - Wet edge retention - Paint viscosity - Thermogravimetric analyzer
- RESULTS AND DISCUSSION : Heat of fusion - Freeze-thaw stability - Evaporation rate
- Table 1: Polymer synthesis, the amount of materials used
- Table 2 : Molecular wieght, particle size, acid number and density of the polymers
- Table 3 : Weight fraction of free water and CUP polymers
- Table 4 : Paint formulation of the master batch
- Table 5 : Weight per gallon, % solids by weight, % solids by volume and PVC of the paint
- Table 6 : Freeze thaw stability (KU viscosity)
- Table 7 : Wet edge retention and open timeDOI : https://doi.org/10.1007/s11998-020-00388-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00388-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35358
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Flame-retardant coatings for rigid polyurethane foam based on mixtures of polysaccharides and polyborate / Isao Tsuyumoto in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Flame-retardant coatings for rigid polyurethane foam based on mixtures of polysaccharides and polyborate Type de document : texte imprimé Auteurs : Isao Tsuyumoto, Auteur Année de publication : 2021 Article en page(s) : p. 155-162 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Mousses plastiques
Polyborate de sodium
Polymères ignifuges
PolysaccharidesLes polysaccharides (parfois appelés glycanes, polyosides, polyholosides ou glucides complexes) sont des polymères constitués de plusieurs oses liés entre eux par des liaisons osidiques.
Les polyosides les plus répandus du règne végétal sont la cellulose et l’amidon, tous deux polymères du glucose.
De nombreux exopolysaccharides (métabolites excrétés par des microbes, champignons, vers (mucus) du ver de terre) jouent un rôle majeur - à échelle moléculaire - dans la formation, qualité et conservation des sols, de l'humus, des agrégats formant les sols et de divers composés "argile-exopolysaccharide" et composites "organo-minéraux"(ex : xanthane, dextrane, le rhamsane, succinoglycanes...).
De nombreux polyosides sont utilisés comme des additifs alimentaires sous forme de fibre (inuline) ou de gomme naturelle.
Ce sont des polymères formés d'un certain nombre d'oses (ou monosaccharides) ayant pour formule générale : -[Cx(H2O)y)]n- (où y est généralement x - 1). On distingue deux catégories de polysaccharides : Les homopolysaccharides (ou homoglycanes) constitués du même monosaccharide : fructanes, glucanes, galactanes, mannanes ; les hétéropolysaccharides (ou hétéroglycanes) formés de différents monosaccharides : hémicelluloses.
Les constituants participant à la construction des polysaccharides peuvent être très divers : hexoses, pentoses, anhydrohexoses, éthers d'oses et esters sulfuriques.
Selon l'architecture de leur chaîne, les polysaccharides peuvent être : linéaires : cellulose ; ramifiés : gomme arabique, amylopectine, dextrane, hémicellulose et mixtes : amidon.
Polyuréthanes
Résistance à l'humidité:Résistance à l'eau
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : New types of flame-retardant coatings for rigid polyurethane foam (RPUF) are developed using mixtures of amorphous sodium polyborate (SPB) and various polysaccharides. Based on our previous research reporting that the RPUF coated with a mixture of SPB and starch shows high flame retardancy, polysaccharides such as carboxymethyl cellulose, hydroxyethyl cellulose, glucomannan, 2-hydroxypropyl guar gum (HPG), and gellan gum are used instead of starch. By coating each mixture on the surface, the RPUF (10 mm thickness) endures the premixed flame of butane gas burner with length of 100 mm for more than 12 min, and the backside temperatures remain within the range of 100–160°C. The high flame retardancy is successfully achieved with lower adhesive amounts of the mixtures (8.9–19.1 mg/cm2) than that of the starch/SPB mixture (51.3 mg/cm2). Water resistance is also substantially improved by using gellan gum, CMC, or glucomannan with NaOH. The elution ratio when immersed in water for 12 h is significantly suppressed to 4.8% using the gellan gum/SPB mixture compared with 80.1% using the starch/SPB mixture. The differential thermal analysis and thermogravimetry of the coating mixtures and the scanning electron microscope observations of combustion residues suggest the flame-retardant mechanism that a carbonaceous foam layer is produced from polysaccharides by the action of SPB foam layer and both of the foam layers protect inside from heat and oxygen. Note de contenu : - Base material
- Coating mixtures of flame retardants
- Measurements
- Table 1 : Flame retardancy, water resistance, and water contact angles of the coatings prepared from SPB and saccharides on RPUFDOI : https://doi.org/10.1007/s11998-020-00390-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00390-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35359
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Modifying of UHMWPE fishing nets with layer-by-layer deposition method for antifouling properties / Gülsah Ekin kartal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Modifying of UHMWPE fishing nets with layer-by-layer deposition method for antifouling properties Type de document : texte imprimé Auteurs : Gülsah Ekin kartal, Auteur ; Ayse Merih Sarusik, Auteur Année de publication : 2021 Article en page(s) : p. 163-171 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Borate de zinc
Caractérisation
Cationisation
Couches minces multicouches
Filets de pêche
Formation de film
Nanoparticules
Oxyde de cuivre
Oxyde de zinc
Polyéthylène à ultra haut poids moléculaire
Polyéthylèneimine
Revêtement monocouche
Revêtements antisalissuresIndex. décimale : 667.9 Revêtements et enduits Résumé : The nanoparticles-based, multilayer, nanocomposite films ZnO, Cu2O, zinc borate, and Econea® were fabricated on cationized ultra-high molecular weight polyethylene (UHMWPE) fishing nets using a layer-by-layer molecular self-assembly technique. For the cationic surface charge, the UHMWPE fishing nets were pretreated with polyethyleneimine using the dip-coating method. Scanning electron microscopy and energy-dispersive X-ray spectroscopy were used to examine the nano-ZnO, Cu2O, zinc borate, and Econea® multilayer films deposited on the fishing nets. The fishing nets were placed in a fish farm located in the Aegean Sea for 6 months. The nano-Econea® films exhibited excellent antifouling activity against microorganisms. To evaluate the effect of the process on antifouling properties, physical tests of the nets were conducted before and after the nanoparticle treatment. The strength of the nets and fouling organisms were examined after the field study. Note de contenu : - EXPERIMENTAL : Materials - Cationization process - Nano-multilayer film formation - Characterization
- RESULTS AND DISCUSSION : Characterization - Fieldwork - Macro-organisms analysis - Solidity of nets - Strength and weight analysis
- Table 1 : Percentage of elemental contents of fishing nets deposited with 16-multilayer nanomaterial films
- Table 2 : Solidity of biofouled fishing nets
- Table 3 : Weighting results of fishing nets deposited with 16-multilayer nanomaterial films before and after the field
- Table 4 : Strength and elongation values of fishing nets deposited with 16-multilayer nanomaterial filmsDOI : https://doi.org/10.1007/s11998-020-00392-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00392-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35360
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Morphology-dependent optical and wetting behavior of GLAD PTFE thin films / Rajnarayan De in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Morphology-dependent optical and wetting behavior of GLAD PTFE thin films Type de document : texte imprimé Auteurs : Rajnarayan De, Auteur ; S. Maidul Haque, Auteur ; Ranveer Singh, Auteur ; C. B. Basak, Auteur ; S. Jena, Auteur ; J. S. Misal, Auteur ; D. D. Shinde, Auteur ; Tapobrata Som, Auteur ; K. Divakar Rao, Auteur Année de publication : 2021 Article en page(s) : p. 173-182 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anti-réflectance
Caractérisation
Dépôt à angle de regard
Hydrophobie
Polytétrafluoréthylène
Revêtement auto-nettoyant
Revêtements organiques
TransmittanceLa transmittance, en général, est le rapport caractérisant la transmission d'une grandeur dans un système. Elle se calcule par le rapport entre la grandeur en entrée et en sortie.
En optique, la transmittance d'un matériau ou d'un filtre est la fraction du flux lumineux le traversant. Elle est également nommée facteur de transmission mais aussi transparence dans le domaine de la photographie.Index. décimale : 667.9 Revêtements et enduits Résumé : E-beam evaporation equipped with glancing angle deposition arrangement (GLAD) was used to fabricate nanostructured polytetrafluoroethylene (PTFE) films in a single-step coating process. Three sets of PTFE coatings were prepared using various oblique angles, e-beam currents, and deposition times to explore the effects of deposition parameters on the properties of PTFE nanostructured coatings. Water contact angle (WCA) of the coatings was found to be enhanced with the increase in all the above process parameters. Optical transmittance of the coatings was also found to be improved with the above parameters except for in the case of an increase in thickness of the films (in very high thickness region), where the transmittance was degraded due to light scattering from the sample surface. After all the optimizations, the ~ 130-nm-thick GLAD PTFE sample prepared with highest e-beam current was found to be more suitable for antireflection and self-cleaning applications. The single-sided coating demonstrates a very high average transmittance of ~ 95.6% (with a wideband transmittance spectrum among the others) in the visible and NIR wavelength range with excellent self-cleaning nature (WCA ~ 156°, sliding angle ~ 10°). The trend of measured WCA with respect to surface roughness follows the Cassie–Baxter model. Overall, the study demonstrates the possibility of fabricating highly transparent self-cleaning coatings using the GLAD technique, which is potentially useful for fabricating protecting cover glasses in solar panels. Note de contenu : - EXPERIMENTAL DETAILS : Fabrication of the nanostructured PTFE films - Characterization of the films
- RESULTS AND DISCUSSION : Effect of deposition angle on the film properties - Effect of e-beam current on the films - Effect of film thickness on CA and transmittance of the coatings
- THEORETICAL CALCULATION OF WCA ON THE ROUGH SURFACES
- Table 1 and 2 : RMS roughness data of the films prepared at different oblique anglesDOI : https://doi.org/10.1007/s11998-020-00395-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00394-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35361
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Effect of the particle sizes of silica on the properties of UV-curing matting coatings / Ziyuan Yang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Effect of the particle sizes of silica on the properties of UV-curing matting coatings Type de document : texte imprimé Auteurs : Ziyuan Yang, Auteur ; Guozhang Ma, Auteur ; Caiying Hou, Auteur ; Yanxia Niu, Auteur ; Huafeng Duan, Auteur ; Xiaogang Hao, Auteur Année de publication : 2021 Article en page(s) : p. 183-192 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agent mattant
Analyse morphologique
Caractérisation
Copolymère uréthane acrylate
Diisocyanate d'isophorone
Dioxyde de silicium
Oligomères
Polyméthacrylate d'hydroxyéthyle
Polypropylène glycol
Revêtements -- Propriétés mécaniques
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
Stabilité thermique
Taille des particulesIndex. décimale : 667.9 Revêtements et enduits Résumé : UV-curable matting composites were prepared by micron silica matting agent, polyether diol (PPG), isophorone diisocyanate (IPDI), and 2-hydroxyethyl methacrylate (HEMA) via the in situ polymerization method. The structure, surface morphology, and thermal stability of the composites were characterized by FTIR, SEM, and TGA, respectively. As the main resin in the UV-curable coating, the effects of particle sizes of silica on the gloss, abrasion resistance, adhesion, and hydrophilic properties of coatings were measured. The results show that the agglomeration phenomenon of the modified silica in the composite coating was obviously improved. The smaller the particle size, the lower the gloss of coatings with the same content. The adhesion strength and abrasion resistance of the composites were superior to those of pure UV-curing coatings without silica. The greater the particle sizes of the added modified silica, the stronger the hydrophilicity of the composite. Note de contenu : - EXPERIMENTAL : Material - Preparation of PUA and PUA/Sio2 oligomer - Preparation of UV-curing matting coating with PUA/Sio2 oligomer - Instrument and characterization
- RESULTS AND DISCUSSION : The structure UV-PUA/Sio2 oligomer - The thermal stability of UV-PUA/SiO2 composite films - Effect of particle size of silica on the surface property of UV-cured films - Effec of particle size of silica on the mechanical property of UV-cured filmsDOI : https://doi.org/10.1007/s11998-020-00395-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00395-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35362
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible The effect of plasma functionalization on the print performance and time stability of graphite nanoplatelet electrically conducting inks / Andrew Claypole in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : The effect of plasma functionalization on the print performance and time stability of graphite nanoplatelet electrically conducting inks Type de document : texte imprimé Auteurs : Andrew Claypole, Auteur ; James Claypole, Auteur ; Tim Claypole, Auteur ; David Gethin, Auteur ; Liam Kilduff, Auteur Année de publication : 2021 Article en page(s) : p. 193-203 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Conduction électrique
Encre d'imprimerie
Encre électronique
Graphite
Nanoparticules
Rhéologie
Surfaces fonctionnelles
Technique des plasmasIndex. décimale : 667.4 Encres Résumé : Carbon-based pastes and inks are used extensively in a wide range of printed electronics because of their widespread availability, electrical conductivity and low cost. Overcoming the inherent tendency of the nano-carbon to agglomerate to form a stable dispersion is necessary if these inks are to be taken from the lab scale to industrial production. Plasma functionalization of graphite nanoplatelets (GNP) adds functional groups to their surface to improve their interaction with the polymer resin. This offers an attractive method to overcome these problems when creating next generation inks. Both dynamic and oscillatory rheology were used to evaluate the stability of inks made with different loadings of functionalized and unfunctionalized GNP in a thin resin, typical of a production ink. The rheology and the printability tests showed the same level of dispersion and electrical performance had been achieved with both functionalized and unfunctionalized GNPs. The unfunctionalized GNPs agglomerate to form larger, lower aspect particles, reducing interparticle interactions and particle–medium interactions. Over a 12-week period, the viscosity, shear thinning behavior and viscoelastic properties of the unfunctionalized GNP inks fell, with decreases in viscosity at 1.17 s−1 of 24, 30, 39% for the ϕ = 0.071, 0.098, 0.127 GNP suspensions, respectively. However, the rheological properties of the functionalized GNP suspensions remained stable as the GNPs interacted better with the polymer in the resin to create a steric barrier which prevented the GNPs from approaching close enough for van der Waals forces to be effective. Note de contenu : - Materials and ink synthesis
- Methods
- Table 1 : Composition of GNP inks, where GNP (graphite nanoplatelets, TPU (thermoplastic polyurethane resin), DAA (diacetone alcohol)
- Table 2 : Three roll millling procedureDOI : https://doi.org/10.1007/s11998-020-00414-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00414-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35363
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Deposition of Au and ZnO nanoparticles from concentrated colloidal dispersions in ethanol on glass, polyethylene terephthalate, polystyrene and silicone substrates for manufacturing simple and combined coatings / Vladimir Tatarchuk in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Deposition of Au and ZnO nanoparticles from concentrated colloidal dispersions in ethanol on glass, polyethylene terephthalate, polystyrene and silicone substrates for manufacturing simple and combined coatings Type de document : texte imprimé Auteurs : Vladimir Tatarchuk, Auteur ; Irina Druzhinina, Auteur ; Evgeny Maksimovskii, Auteur ; Sergei Gromilov, Auteur Année de publication : 2021 Article en page(s) : p. 205-228 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colloides
Composites
Dispersions et suspensions
Nanoparticules
Or
Oxyde de zinc
Polyéthylène téréphtalate
Polystyrène
Revêtements
Revêtements multicouches
SemiconducteursIndex. décimale : 667.9 Revêtements et enduits Résumé : The deposition of coatings of Au and ZnO nanoparticles (NPs) on glass, semiconductor silicon, polyethylene terephthalate, and polystyrene substrates was studied. Deposition was carried out using relatively concentrated dispersions of particles in ethanol (approximately 5–10 mM Au, ZnO), which showed limited time resistance to coagulation and sedimentation, but returned to their original dispersed state by ultrasonic treatment before each cycle of deposition of NPs. The NPs of Au and ZnO were stabilized by abietate and acetate ions, respectively. Simple coatings from Au or ZnO NPs and a combined coating from a mixture of Au and ZnO NPs, as well as two-layer combined coatings with alternating layers of Au/ZnO and ZnO/Au NPs, were obtained by drop casting and the proposed method of deposition from the capillary layer of the dispersion with the use of a linker. The formation of coatings on transparent substrates was studied by means of UV–Vis spectroscopy. Coatings were characterized by SEM, EDX, XRD, PL, UV–Vis and surface resistance methods. The effect of heat treatment on coatings characteristics was tested. Note de contenu : - EXPERIMENTAL : Materials - Syntheses - Substrate treatment - Coating deposition methods - Study methods
- RESULTS AND DISCUSSION : Coagulation/sedimentation and regeneration of dispersions - Formation of coatings by DCLD - Formation of coatings by DC - Morphology and composition - Optical and electrical characteristics
- Table 1 : Samples and codes
- Table 2 : Parameters of linear dependences during the formation of two-sided coatings by the DLCD method
- Table 3 : Parameters of linear dependences during the formation of one-sided two-layer coatings by the DC method
- Table 4 : The effect of heat treatment on the size of gold crystallites and on the surface resistance of coatings
- Table 5 : EDX results for coatings on glass before and after heating at 380°CDOI : https://doi.org/10.1007/s11998-020-00397-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00397-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35364
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Influence of functional group content in hydroxyl-functionalized urethane methacrylate oligomers on the crosslinking features of clearcoats / Young-Gun June in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Influence of functional group content in hydroxyl-functionalized urethane methacrylate oligomers on the crosslinking features of clearcoats Type de document : texte imprimé Auteurs : Young-Gun June, Auteur ; Kevin Injoe Jung, Auteur ; Dong Geun Lee, Auteur ; Subin Jeong, Auteur ; Tae-Hee Lee, Auteur ; Young Il Park, Auteur ; Seung Man Noh, Auteur ; Hyun Wook Jung, Auteur Année de publication : 2021 Article en page(s) : p. 229-237 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Basses températures
Liants
Méthacrylate d'uréthane
Oligomères
Réticulants
Réticulation (polymérisation)
Revêtements organiques
VernisIndex. décimale : 667.9 Revêtements et enduits Résumé : Crosslinking characteristics and surface mechanical properties of radical and urethane dual-curable clearcoats were investigated by changing quantities of C=C bonds and OH groups in hydroxyl-functionalized urethane methacrylate oligomer (HFUMO) resins. The isocyanate blocked with a thermal radical initiator (BL-Tri-cHD) was utilized as a hybrid dual-curable thermal crosslinker to expedite the crosslinking of the main resin. The dual reactions between various HFUMO resins and BL-Tri-cHD were efficiently monitored via Fourier transform infrared spectroscopy to measure the peaks before and after curing. The influence of each functional group (C=C bond or OH group) in HFUMO on the initiation and development of crosslinking in dual-curable clearcoats was investigated by real-time measurements using rotational rheometer and rigid body pendulum tester. Temperature-dependent mechanical properties of cured films were confirmed through dynamic mechanical analysis. The surface mechanical properties of cured clearcoat films were also evaluated via the nanoindentation and nanoscratch tests, demonstrating the variation in surface resistance with respect to the C=C bond content and the OH value. Thus, the low-temperature curing and desired mechanical properties of clearcoats can be optimized by adjusting the content of the functional groups in a HFUMO and using a dual-curable crosslinker to simultaneously generate both radical and urethane crosslinking reactions. Note de contenu : - EXPERIMENTAL METHOS : Synthesis of HFUMOs and blocked isocyanate using a TRI (BL-Tri-cHD) - Formulation of clearcoats with various HFUMO resins - Variations in functional groups by FTIR analysis - Real-time crosslinking behaviors of HFUMO-based clearcoats - Dynamic mechanical analysis of cured films - Surface mechanical properties of cured films
- RESULTS AND DISCUSSION : FTIR analysis of clearcoats with varying quantities of functional groups in HFUMOs - Rheological analysis of crosslinking behavior - Analysis of curing behaviors using RPT - Dynamic mechanical analysis - Indentation depth profiles - Scratch depth profiles
- Table 1 : Formulation of clearcoat mixtures with various HFUMOs with different contents of C=C bond and OH groupDOI : https://doi.org/10.1007/s11998-020-00398-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00398-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35365
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Attributing the crosslinking density to water vapor transmission rate of an acrylic-melamine automotive clearcoat / M. Nasirzadeh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Attributing the crosslinking density to water vapor transmission rate of an acrylic-melamine automotive clearcoat Type de document : texte imprimé Auteurs : M. Nasirzadeh, Auteur ; H. Yahyaei, Auteur ; S. M. Lashgari, Auteur ; Mohsen Mohseni, Auteur Année de publication : 2021 Article en page(s) : p. 239-246 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique
Angle de contact
Caractérisation
Copolymère acrylique mélamine
Densité
Dureté (matériaux)
Formulation (Génie chimique)
Résistance chimique
Réticulation (polymérisation)
Transmission de vapeur d'humidité
VernisIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, the effect of crosslinking density of an acrylic-melamine clearcoat on water vapor transmission rate was evaluated. Four types of acrylic resins with different OH contents were used as the main polymeric backbone of the acrylic-melamine clearcoat. Also, three different acrylics to melamine–formaldehyde ratios were used in the coating formulations to obtain various crosslinking densities. It was observed that other film properties such as surface hydrophilicity and molecular homogeneity had a crucial impact on the clearcoat water vapor transmission rate together with the crosslinking density. Surprisingly, results showed that samples with acrylic resin with less OH content and lower melamine–formaldehyde crosslinker had the lowest water vapor transmission rate among other samples. These results were in agreement with the water contact angle and the data deduced from dynamic mechanical thermal analysis (DMTA) results of clearcoats. Note de contenu : - EXPERIMENTAL : Materials - Preparation of acrylic-melamine clearcoat
- CHARACTERIZATION
- RESULTS AND DISCUSSION
- WATER CONTACT ANGLE : ATR-FTIR results - Solvent resistance - The hardness of the clearcoats - Dynamic mechanical thermal properties (DMTA) - Water vapor transmission rate
- Table 1 : The composition of clearcoats
- Table 2 : Water contact angle with clearcoats (degree)
- Table 3 : The hardness results (with standard deviation) of the clearcoats
- Table 4 : The crosslink density of the clearcoats calculated with storage modulus in rubber plateau
- Table 5 : The homogenity data obtained from loss tangent graphs
- Table 6 : Water vapor transmission, grams per square meter per 24hDOI : https://doi.org/10.1007/s11998-020-00400-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00400-w.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35366
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Effect of polyethylene wax/soy protein-based dispersion barrier coating on the physical, mechanical, and barrier characteristics of paperboards / Pouya Marzbani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Effect of polyethylene wax/soy protein-based dispersion barrier coating on the physical, mechanical, and barrier characteristics of paperboards Type de document : texte imprimé Auteurs : Pouya Marzbani, Auteur ; Mohammad Azadfallah, Auteur ; Maryam Yousefzadeh, Auteur ; Farhood Najafi, Auteur ; Ahmad Ali Pourbabaee, Auteur ; Hanna Koivula, Auteur ; Mikko Ritala, Auteur Année de publication : 2021 Article en page(s) : p. 247-257 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cartonnages
Cires
Dispersions et suspensions
Polyéthylène
Protéines végétales
Soja et constituantsIndex. décimale : 667.9 Revêtements et enduits Résumé : Application of barrier dispersion coatings on paperboards, which must have proper moisture and grease resistance for food applications, has always been an interesting subject for the packaging industry. In this study, paperboards were coated with a novel dispersion barrier coating prepared through mixing soy protein isolate (SPI) and polyethylene wax (PE-wax). Different characterization methods were used to study the effects of coating and its composition on the physical, mechanical, and barrier characteristics of paperboards. The results indicated that the incorporation of PE-wax into the coating formulation caused significant reduction of the viscosity of coating slurries. It had no effect on the coating weight of the samples but increased the thickness of the coated paperboards as compared with those coated with SPI only. The increase of the wax content led to a reduction of 5–16% in the tensile strength values in comparison with the uncoated paperboards. Barrier characteristics, i.e., water vapor permeability (WVP), surface wettability, and water resistance, improved by adding PE-wax. In addition, it was found that there was a critical level for the addition of PE-wax, 50% of SPI, as no oil migration was detected when the paperboards coated with SPI coatings contained less than 50% PE-wax. Note de contenu : - EXPERIMENTAL : Materials - Methods
- RESULTS AND DISCUSSION : Solid content and viscosity of coatings - Physical characteristics - Mechanical characteristics - Barrier characteristics - Morphological characteristics
- Table 1 : Rheological characteristics of the coatings. The superscript lowercase letters show significant differences. The means followed by the same letter show no significant differences between the treatments
- Table 2 : Physical and mechanical characteristics of the paperboard samples. The superscript lowercase letters show significant differences. The means followed by the same letter show no significant differences between the treatments
- Table 3 : Barrier characteristics of the paperboard samples. The superscript lowercase letters show significant differences. The means followed by the same letter show no significant differences between the treatmentsDOI : https://doi.org/10.1007/s11998-020-00403-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00403-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35367
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of a novel hyperbranched polyester with carboxyl end groups applied to UV-curable waterborne coating / Jieming Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Synthesis of a novel hyperbranched polyester with carboxyl end groups applied to UV-curable waterborne coating Type de document : texte imprimé Auteurs : Jieming Liu, Auteur ; Shaoshun Wang, Auteur ; Qiuping Su, Auteur ; Jiajian He, Auteur ; Yong Li, Auteur ; Jing Xie, Auteur ; Guobin Yi, Auteur Année de publication : 2021 Article en page(s) : p. 259-269 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Caractérisation
Groupement carboxyle
Hydrostabilité
Polyesters
Polymères -- Synthèse
Polymères ramifiés
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements en phase aqueuse
Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Rhéologie
SolubilitéIndex. décimale : 667.9 Revêtements et enduits Résumé : A hyperbranched polyester with carboxyl end group (HPC) was synthesized by using trimellitic anhydride and neopentyl glycol as raw materials via A2 + B3 polycondensation. Then, waterborne hyperbranched polyester acrylate (WHPC) was synthesized by partially modifying the carboxylic groups of HPC with glycidyl methacrylate. In order to explore the influence of molecular weight, acrylate groups content, and ion groups content on performances, a series of WHPC films with different molecular weight, acrylate groups content, and ion groups content were prepared. The dynamic light scattering spectrometer analysis shows that the higher ionic groups content and the lower molecular weight cause the smaller particle size. The ionic group content has a positive effect on the solubility. The smaller molecular weight and particle size cause the lower viscosity. The Fourier-transform IR spectrophotometer reveals that the double bond final conversion increased with increasing acrylate groups content. The final conversion is between 69 and 86%. The curing speed is fast, and the curing time is about 70 s due to the numerous end groups owned by the hyperbranched structure. The dynamic mechanical thermal analysis coupled with end-use mechanical property tests illustrates that the crosslink density has a positive effect on the storage modulus and a negative effect on the flexibility. It is also found that glass transition temperature and pencil hardness are determined by the balance between crosslink segment and hyperbranched polyester segment. The thermogravimetric analysis proves that increased crosslink density and molecular weight promote the heat resistance of films. This work utilizes a novel hyperbranched structure that excels in viscosity, flexibility, and water solubility. Furthermore, the preparation process is convenient. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hyperbranched polyester with carboxyl end groups (HPC) - Synthesis of waterborne hyperbranched polyester acrylate (WHPC) - Neutralization of the prepolymer - Dispersion formation - UV curing - Measurements
- RESULTS AND DISCUSSION : Characterizations of hyperbranched polyester - Gel permeable chromatography (GPC) analysis - Particle size - Rheological behavior - Water solubility and stability - Curing kinetics and boule bond conversion - Dynamic mechanical thermal analysis (DMTA) - Thermal properties
- Table 1 : Sample designation and stoichiometric ration of -COO- and GMA for the preparation of WHPC
- Table 2 : The particle diameter in water and COO- groups content of WHPCs
- Table 3 : Dynamic mechanical properties of the UV-cured coatings
- Table 4 : The mechanical properties and performance of the UV-cured coatings
- Table 5 : The degradation temperature at 5% weight lossDOI : https://doi.org/10.1007/s11998-020-00404-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00404-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35368
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Basalt fibers as functional additives in coating of textiles / Carolin Ruffen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Basalt fibers as functional additives in coating of textiles Type de document : texte imprimé Auteurs : Carolin Ruffen, Auteur ; Boris Mahltig, Auteur Année de publication : 2021 Article en page(s) : p. 271-281 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
CotonLe coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles).
Enduction textile
Fibres de basalte
Protection contre le rayonnement infrarouge
Protection contre le rayonnement ultraviolet
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : In the presented study, basalt fibers are used as additives in polymer coatings applied onto textiles substrates. As basalt fibers, short fibers with diameters of around 13 µm and with lengths in the range of 0.16–4 mm are used. As the textile substrate, a cotton fabric is used. The polymer coatings are based on acrylate or polyurethane. As a further coating additive, the silicate compound Aerosil is also evaluated. The realized coated materials are investigated by scanning electron microscopy (SEM) and by optical spectroscopy in arrangement of diffusive reflection and transmission. The optical spectra are recorded in a spectral range from 220 to 1400 nm. By these optical measurements, it is demonstrated that the optical properties for UV-light, visible light and near infrared light are influenced by the basalt-containing coatings. The transmission for UV-light is drastically reduced. It is possible to decrease the transmission for infrared light drastically by use of these coating while the IR-reflectance stays on a significant level. In future perspective, these types of coatings could be used as protection against both UV- and IR-light. The surface topography of realized coatings is dominated by the applied basalt fibers. In the case of medium or high basalt fiber concentration, a parallel orientation of some basalt fibers occurs. This type of parallel arrangement could be used in future perspective for different types of applications, e.g., the development of new filter materials. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation - Analytics
- RESULTS AND DISCUSSIONS : Microscopic investigations - Spectroscopic investigationsDOI : https://doi.org/10.1007/s11998-020-00383-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00383-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35369
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