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JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH . Vol. 18, N° 4Mention de date : 07/2021Paru le : 14/09/2021 |
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Ajouter le résultat dans votre panierA brief review of the graphene oxide-based polymer nanocomposite coatings: preparation, characterization, and properties / Zahra Shahryari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : A brief review of the graphene oxide-based polymer nanocomposite coatings: preparation, characterization, and properties Type de document : texte imprimé Auteurs : Zahra Shahryari, Auteur ; Mahdi Yeganeh, Auteur ; Khalil Gheisari, Auteur ; Bahram Ramezanzadeh, Auteur Année de publication : 2021 Article en page(s) : p. 945–969 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
Anticorrosifs
Anticorrosion
Caractérisation
Matériaux hybrides
Matériaux hybrides -- Propriétés électriques
Matériaux hybrides -- Propriétés mécaniques
Oxyde de graphène
Polymères
Polymères -- Synthèse
Revêtements protecteurs
ThermocinétiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Graphene oxide (GO), due to its large surface area and suitable active sites, is receiving significant attention as a good additive in various coatings due to its excellent chemical resistance, anticorrosion, and high mechanical performances. Furthermore, due to its unique structural dimensions and electrical, thermal, optical, and chemical properties, GO has attracted notable interest in diverse areas, including biomedical and antibacterial applications. This review focuses on the polymer nanocomposite coatings embedded with GO, their synthesis methods, and the role of GO to improve the corrosion protection performance, mechanical and electrical properties, antibacterial application, and thermal conductivity. Note de contenu : - GRAPHENE OXIDE (INTRODUCTION AND HISTORY)
- GRAPHENE OXIDE IN THE POLYMER COMPOSITE COATINGS
- SURFACE FUNCTIONALIZATION OF GRAPHENE OXIDE : Covalent modification of graphene oxide - Noncovalent modification of graphene oxide - Other modification agents of graphene oxide
- SYNTHESIS ROUTES OF POLYMER/GRAPHENE OXIDE COMPOSITE : Melt blending - Solution mixing - In situ polymerization method
- CHARACTERISTICS OF GO/POLYMER NANOCOMPOSITES : Corrosion protective performance - Mechanical properties of GO/polymer nanocomposites - Electrical properties of GO/polymer nanocomposite - Antibacterial behavior of GO/polymer nanocomposite - Thermal conductivity of the GO/polymer nanocompositeDOI : https://doi.org/10.1007/s11998-021-00488-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00488-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36205
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Toward CNT-reinforced chitosan-based ceramic composite coatings on biodegradable magnesium for surgical implants / A. A. Francis in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Toward CNT-reinforced chitosan-based ceramic composite coatings on biodegradable magnesium for surgical implants Type de document : texte imprimé Auteurs : A. A. Francis, Auteur ; S. A. Abdel-Gawad, Auteur ; M. A. Shoeib, Auteur Année de publication : 2021 Article en page(s) : p. 971–988 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
ChitosaneLe chitosane ou chitosan est un polyoside composé de la distribution aléatoire de D-glucosamine liée en ß-(1-4) (unité désacétylée) et de N-acétyl-D-glucosamine (unité acétylée). Il est produit par désacétylation chimique (en milieu alcalin) ou enzymatique de la chitine, le composant de l'exosquelette des arthropodes (crustacés) ou de l'endosquelette des céphalopodes (calmars...) ou encore de la paroi des champignons. Cette matière première est déminéralisée par traitement à l'acide chlorhydrique, puis déprotéinée en présence de soude ou de potasse et enfin décolorée grâce à un agent oxydant. Le degré d'acétylation (DA) est le pourcentage d'unités acétylées par rapport au nombre d'unités totales, il peut être déterminé par spectroscopie infrarouge à transformée de Fourier (IR-TF) ou par un titrage par une base forte. La frontière entre chitosane et chitine correspond à un DA de 50 % : en deçà le composé est nommé chitosane, au-delà, chitine. Le chitosane est soluble en milieu acide contrairement à la chitine qui est insoluble. Il est important de faire la distinction entre le degré d'acétylation (DA) et le degré de déacétylation (DD). L'un étant l'inverse de l'autre c'est-à-dire que du chitosane ayant un DD de 85 %, possède 15 % de groupements acétyles et 85 % de groupements amines sur ses chaînes.
Le chitosane est biodégradable et biocompatible (notamment hémocompatible). Il est également bactériostatique et fongistatique.
Le chitosane est également utilisé pour le traitement des eaux usées par filtration ainsi que dans divers domaines comme la cosmétique, la diététique et la médecine.
MagnésiumLe magnésium est l'élément chimique de numéro atomique 12, de symbole Mg.
Le magnésium est un métal alcalino-terreux. Il s’agit du neuvième élément le plus abondant de l'univers
. Il est le produit, dans de grandes étoiles vieillissantes, de l'addition séquentielle de trois noyaux d'hélium à un noyau carbo. Lorsque de telles étoiles explosent en tant que supernovas, une grande partie du magnésium est expulsé dans le milieu interstellaire où il peut se recycler dans de nouveaux systèmes stellaires. Le magnésium est le huitième élément le plus abondant de la croûte terrestreet le quatrième élément le plus commun de la Terre (après le fer, l'oxygène et le silicium), constituant 13 % de la masse de la planète et une grande partie du manteau de la planète. C'est le troisième élément le plus abondant dissous dans l'eau de mer, après le sodium et le chlore.
Les atomes de magnésium existent dans la nature uniquement sous forme de combinaisons avec d'autres éléments, où il présente invariablement l'état d'oxydation +2. L'élément pur est produit artificiellement par réduction ou électrolyse. Il est hautement réactif en poudre et en copeaux mais, laissé à l'air libre, il se revêt rapidement d'une mince couche d'oxyde étanche réduisant sa réactivité (passivation par oxydation). Le métal pur brûle aisément sous certaines conditions (en produisant une lumière brillante, blanche, éblouissante caractéristique). En mécanique il est utilisé principalement comme composant dans les alliages d'aluminium-magnésium (parfois appelés magnalium). Le magnésium est moins dense que l'aluminium et l'alliage est apprécié pour sa légèreté et sa résistance plus grande (mécanique et chimique). (Wikipedia)
Nanotubes de carbone à parois multiplesUn nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets :
- le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ;
- le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier.
Revêtement de céramique
Revêtement de conversionIndex. décimale : 667.9 Revêtements et enduits Résumé : Biomaterials containing carbon nanotubes (CNTs) represent a class of composites, which have generally been underexploited in the medical field. However, recognition of the potential utility of this class of composite materials may form the basis to develop new CNT biomaterials for implants and regenerative medicine scaffolds. Nanocomposite coatings containing chitosan matrix (CHI) reinforced with multiwall CNTs and CaHPO4 (DCPA) were deposited on pure magnesium substrates using a flexible chemical conversion approach. Field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy were applied to characterize the morphological, chemical, and physical changes that occurred in the composite coatings. The in vitro degradation behavior of the composite-coated samples was evaluated using electrochemical impedance spectroscopy in Hank’s solution. Results showed that the tri-phasic composite coating (CHI/CNTs/DCPA) exhibits the highest electrochemical corrosion resistance in comparison with the bi-phasic composite coating (CHI/CNTs and CHI/DCPA) and monophasic CHI-coated magnesium. Potentiodynamic polarization results in Hank’s solution indicate that the corrosion potential of the tri-phasic coated Mg is − 1.5 V, while the corrosion current density reaches 0.36 µA/cm2. Functionalization of the Mg surface by activation at 75°C produces a rough surface that triggers a combination of chemical and physical interactions between the three phases and Mg ions present in the reaction medium. The bi-phasic (CHI/CNTS) and tri-phasic (CHI/CNTs/CaHPO4) composite coatings revealed high antibacterial performance against Staphylococcus aureus. These corrosion results and the successful deposition of CNT-reinforced CHI/DCPA on pure Mg substrate suggest that the conversion coating approach is effective for the production of new composite coatings for either regenerative medicine or functional implants. As such, the present research might lay the groundwork for a new generation of uses for this versatile class of composite coating materials. Note de contenu : - Table 1 : Corrosion parameters from potentiodynamic polarization curves of coated magnesium-based alloys from the present work and literature data
- Table 2 : Electrochemical corrosion parameters from potentiodynamic polarization curves and EIS data of pure magnesium substrate, monophasic, bi-phasic, and tri-phasic coated magnesium samples recorded in Hank's solution
- Table 3 : In vitro antibacterial activity of bi-phasic (CHI/CNTs) and tri-phasic (CHI/CNTs/DCPA) coated magnesium for 24 hours against Staphylococcus aureusDOI : https://doi.org/10.1007/s11998-021-00468-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00468-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36206
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible CO2-triggered hydrophobic/hydrophilic switchable waterborne polyurethane-acrylate with simultaneously improved water resistance and mechanical properties / Liangfeng Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : CO2-triggered hydrophobic/hydrophilic switchable waterborne polyurethane-acrylate with simultaneously improved water resistance and mechanical properties Type de document : texte imprimé Auteurs : Liangfeng Xu, Auteur ; Zhaofei Wang, Auteur ; Gongwen Yang, Auteur ; Guobing Zhang, Auteur ; Haibing Wei, Auteur ; Huagao Fang, Auteur ; Yunsheng Ding, Auteur Année de publication : 2021 Article en page(s) : p. 989–998 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Caractérisation
Copolymère uréthane acrylate
Méthacrylate de méthyle
Polymères -- Propriétés mécaniques
Polymères -- Synthèse
Polymères en émulsion
Polyuréthanes
Résistance à l'humidité:Résistance à l'eau
Revêtements -- Propriétés thermiques
Revêtements organiques
ThermogravimétrieIndex. décimale : 667.9 Revêtements et enduits Résumé : Traditional waterborne polyurethane (WPU) has poor water resistance because of the incorporation of permanent hydrophilic groups, such as carboxyl group or ammonium salt, into polymer chains. Therefore, developing WPU with excellent water resistance and mechanical properties is highly desirable for industrial applications. In this study, CO2-triggered hydrophobic/hydrophilic switchable waterborne polyurethane–acrylate (WPUA) containing methyl methacrylate (MMA) units were designed and synthesized. The molecular structure, hydrophobic/hydrophilic switchable behavior, water resistance, and mechanical properties were systematically investigated and characterized. The WPUA with 10 wt% MMA exhibited a low water uptake (2.15 wt%) and linear swelling ratio (0.17 L%), as well as a high tensile strength (16.7 MPa) and modulus (85.9 MPa), which were much higher than those of the pristine WPU. This study indicated that the CO2-triggered WPUA dispersed stably as latex particles in water and possessed excellent water resistance and mechanical properties after the film formation. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of WPU and WPUA emulsions - Preparation of WPU and WPUA films - Characterizations
- RESULTS AND DISCUSSION : Structures of WPU-pre, WPU, and WPUA filmsHydrophilic/hydrophobic switchable behaviors
of WPUA emulsions - Water resistance of WPU and WPUA films - Mechanical and thermal properties of WPU
and WPUA films - Thermal properties of WPU and WPUA films
- Table 1 : The compositions of WPU and WPUA emulsions
- Table 2 : The linear swelling ratio, water uptake, water contact angle, and gel content of WPU and WPUA
- Table 3 : Mechanical data of WPU and WPUA films
- Table 4 : TGA and DSC data of WPU and WPUA filmsDOI : https://doi.org/10.1007/s11998-021-00476-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00476-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36207
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Polyaniline encapsulated a-zirconium phosphate nanosheet for enforcing anticorrosion performance of epoxy coating / Yue Situ in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Polyaniline encapsulated a-zirconium phosphate nanosheet for enforcing anticorrosion performance of epoxy coating Type de document : texte imprimé Auteurs : Yue Situ, Auteur ; Yanlin Guo, Auteur ; Weiwei Ji, Auteur ; Defei Liu, Auteur ; Dan Wei, Auteur ; Hong Huang, Auteur Année de publication : 2021 Article en page(s) : p. 999-1012 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Caractérisation
Electrochimie
Encapsulation
Epoxydes
Humidité -- Absorption:Eau -- Absorption
Nanoparticules
Phosphate de zirconium
Polyacrylonitrile
Polymérisation par oxydation
Revêtements organiques
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyaniline (PANI) encapsulated α-zirconium phosphate (α-ZrP) nanocomposites (PANI/α-ZrP) were prepared by in situ oxidative polymerization and used as anticorrosive filler in epoxy coatings. Water absorption test and electrochemical measurements in 3.5 wt.% NaCl solution were conducted to assess the barrier properties and anticorrosion performances of different coating systems. PANI/α-ZrP composite epoxy coating showed remarkably enhanced corrosion resistance comparing to neat epoxy coating because of “maze effect” from α-ZrP and “passivation effect” from PANI. The α-ZrP nanosheets could be completely encapsulated by PANI with appropriate PANI/α-ZrP mass ratio, and the resulting nanocomposite exhibited optimal corrosion protection properties. Note de contenu : - EXPERIMENTAL : Materials and sample pretreatment - Synthesis of a-zirconium phosphate (a-ZrP) - Synthesis of polyaniline/a-zirconium phosphate
(PANI/a-ZrP) nanocomposite - Fabrication of coating- Characterizations of nanocomposite and coating - Water absorption and anticorrosion performance
test - Characterization of substrate after being corroded
- RESULTS AND DISCUSSION : Characterization of coating Anticorrosive performance of coatings
- Table 1 : Equivalent electrical circuit models fitted for all coating systems at different immersion times
- Table 2 : Electrochemical parameters fitted from equivalent circuit
- Table 3 : Electrochemical parameters of all coating systems after 16 days of immersion in 3.5 wt.% NaCl solutionDOI : https://doi.org/10.1007/s11998-021-00452-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00452-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36208
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible The effect of rue (Ruta graveolens) and ginger (Zingiber officinale) extracts as antifouling agents in silicone matrix coatings / Ariane V. Zmozinski in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : The effect of rue (Ruta graveolens) and ginger (Zingiber officinale) extracts as antifouling agents in silicone matrix coatings Type de document : texte imprimé Auteurs : Ariane V. Zmozinski, Auteur ; Rafael S. Peres, Auteur ; Flávia Roberta Brust, Auteur ; Alexandre José Macedo, Auteur ; Emilene Mendes Becker, Auteur ; Amanda Pasinato Napp, Auteur ; Henrique Alves de Brito, Auteur ; Marilene H. Vainstein, Auteur ; Augusto Schrank, Auteur ; Carlos Arthur Ferreira, Auteur Année de publication : 2021 Article en page(s) : p. 1013-1025 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse électrochimique
Caractérisation
Essais (technologie)
Extraits de plantes
Gingembre et constituants
Oléorésines
Revêtements antisalissures:Peinture antisalissures
Revêtements organiques
Rue (plante) et constituants
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).Index. décimale : 667.9 Revêtements et enduits Résumé : The use of rue extract and ginger oleoresin as natural antifouling agents in a silicone matrix was verified in this work. 13C nuclear magnetic resonance (13C NMR) analysis identified a series of compounds with bactericidal properties in the two investigated natural products. Thermogravimetric analyses showed that the addition of rue extract and ginger oleoresin in the silicone matrix increased the thermal stability of the formed films. Electrochemical impedance spectroscopy analysis showed that the presence of both antifouling agents increases the velocity of water diffusion into the film, improving contact between marine water and the two products. Fourier transform infrared spectroscopy confirms that both antifouling agents were trapped inside the silicone matrix. Bacterial adhesion tests showed that rue extract reduced the adhesion of gram-negative bacteria, Escherichia coli, while ginger oleoresin did not show any significant effect. Optical microscopy images demonstrated that the presence of rue extract slightly increased the film’s porosity without impairing the silicone hydrophobicity, while ginger oleoresin significantly altered the film's morphology (reducing the water contact angle). Finally, the sample containing rue extract showed excellent results against marine fouling after 6 months of immersion in a real marine environment. The polymer containing ginger oleoresin showed satisfactory results against marine fouling ; however, the film showed adhesion failures after 6 months. Note de contenu : - EXPERIMENTAL : Materials - Preparation of rue extract - Preparation of silicone coatings - Marine fouling tests - Electrochemical tests - In vitro bacterial adhesion test - Characterization
- RESULTS AND DISCUSSION : Chemical characterization - TGA - Electrochemical analysis - Surface characterization - Bacterial adhesion - Antifouling tests
- Table 1 : Samples composition
- Table 2 : TGA and DTG data from the RUTA and GEN samples
- Table 3 : Transport parameters obtained for blank, GEN, and RUTA samplesDOI : https://doi.org/10.1007/s11998-021-00454-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00454-w.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36209
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Preparation and evaluation of a UV-curing hydrophilic semi-IPN coating for medical guidewires / Wenfei Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Preparation and evaluation of a UV-curing hydrophilic semi-IPN coating for medical guidewires Type de document : texte imprimé Auteurs : Wenfei Ding, Auteur ; Zheng Zhao, Auteur ; Lingmei Jiang, Auteur ; Xigao Jian, Auteur ; Yuan Song, Auteur ; Jinyan Wang, Auteur Année de publication : 2021 Article en page(s) : p. 1027–1035 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Biocompatibilité
Caractérisation
Copolymère uréthane acrylate
Copolymères -- Synthèse
Durée de vie (Ingénierie)
Enrobage (technologie)
Essais (technologie)
Hydrophilie
Morphologie (matériaux)
Mouillabilité
Mouillage (chimie des surfaces)
Oligomères
Photoréticulation
Polyéthylene glycol diacrylate
Polyvinylpyrrolidone
Réseaux polymères
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Guidewires have crucial roles in intravascular, critical care, and urological applications. In recent years, the demand for guidewires with lower friction surfaces has arisen for medical applications. Among various surface lubrication strategies for guidewires, the most promising is the use of a hydrophilic coating. However, obtaining a hydrophilic coating on guidewires with strong adhesion remains difficult owing to the surface energy difference between the substrate and hydrophilic coating. Herein, we present a UV-curing semi-interpenetrating polymer network coating for medical thermoplastic polyurethane (TPU)-sheathed nitinol guidewires. A polyurethane acrylate (PUA) was synthesized and cured as a transition layer on the TPU substrate to provide strong adhesion. Then, polyvinyl pyrrolidone (PVP) and polyethylene glycol diacrylate (PEGDA) permeated into the PUA layer and cured to form the composite coating. The PUA–PEGDA–PVP coating exhibited excellent lubricity and satisfactory adhesion force. The surface coefficient of friction decreased to approximately 0.02 after modification with the coating, and the coating was stable during long-term soaking in water and repeated friction. In vitro toxicity tests revealed that the coating had good biocompatibility. Thus, our PUA–PEGDA–PVP coating has the potential for application as super-lubricity guidewires and other medical devices. Note de contenu : - EXPERIMENTAL MATERIALS AND METHODS : Materials - Synthesis of PUA oligomer - Preparation of prepolymer solution - Preparation of PUA–PEGDA–PVP coating on TPU panels and guidewires - Characterization - Cross-cut tests - Wetting tests - Friction tests - Durability tests -In vitro cytotoxicity testsHemolytic test
- RESULTS AND DISCUSSION : Synthesis of the PUA oligomer - Preparation and morphology of the PUA–PEGDA–PVP coating - Adhesion and wetting ability - Lubricating performance of PUA–PEGDA–PVP - guidewires - Durability of the PUA–PEGDA–PVP coating - In vitro toxicity and hemolysisDOI : https://doi.org/10.1007/s11998-021-00455-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00455-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36210
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Super-structural 2D ultrathin carbon nitride/acrylate boron silane polymer with multi-function for enhancing antifouling performance / Yakun Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
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Titre : Super-structural 2D ultrathin carbon nitride/acrylate boron silane polymer with multi-function for enhancing antifouling performance Type de document : texte imprimé Auteurs : Yakun Li, Auteur ; Jianjun Liao, Auteur ; Haiqi Zhang, Auteur ; Xingsan Tang, Auteur ; Shiqiang Zhong, Auteur ; Youguo Yu, Auteur ; Qiuxia Li, Auteur Année de publication : 2021 Article en page(s) : 1051-1064 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylate de bore
Antibactériens
Caractérisation
Mouillabilité
Nitrure de carbone
Polymères -- Synthèse
Revêtement auto-nettoyant
Revêtements antisalissures
Revêtements organiques
Silane de bore
Surfaces (Physique)Index. décimale : 667.9 Revêtements et enduits Résumé : Haunted by marine biofouling and the ecological crisis caused by toxic antifouling paints, the demand for environmental coatings has become more and more pressing. In this work, a series of super-structural 2D ultrathin carbon nitride/acrylate boron silane polymers (CNPs) was prepared by incorporating C3N4 into a self-polishing acrylate boron silane polymer (ABSP). The antifouling, environmental performances were evaluated, and the antifouling mechanism was investigated. The results showed that when the content of C3N4 was 3–7 wt%, the coatings showed the best resistance to diatoms, Staphylococcus aureus and Escherichia coli in visible light. It was noted that the coatings showed weak antibacterial properties in the dark. In addition, the CNPs and ABSP were shown to expel mussels by photocatalytic active species, self-renewal and amphiphilic surfaces. The chemical oxygen demand (COD) values showed that the addition of C3N4 made the CNPs become environmental coatings. Note de contenu : - EXPERIMENTAL : Materials - Preparation of sheet-like ultrathin C3N4 particles - Synthesis of ABSP - Preparation of CNPs - Characterization
- RESULTS AND DISCUSSION : Surface topography of CNPs film - Surface wettability and surface charge properties of CNPs - Thickness and diatom antisettling test - Environmental performance of CNPs - Photocatalytic antibacterial experiments - Mussel settlement assay - Photocatalytic antibacterial mechanism of CNPs filmsDOI : https://doi.org/10.1007/s11998-021-00459-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00459-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36211
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Robust and flexible transparent protective film fabricated with an ambient-curable hybrid resin / Haitao Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Robust and flexible transparent protective film fabricated with an ambient-curable hybrid resin Type de document : texte imprimé Auteurs : Haitao Liu, Auteur ; Hailin Cao, Auteur ; Yudong Huang, Auteur ; Pengcong Shao, Auteur ; Yiwu Yan, Auteur Année de publication : 2021 Article en page(s) : p. 1065–1073 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Dureté (matériaux)
Polyéthylène téréphtalate
Polymères -- Synthèse
Polymères à terminaison silane
Polymérisation
Procédés de fabrication
Revêtements organiques
Souplesse (mécanique)
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : An ambient-curable hybrid resin (ACHR) terminated with trimethoxysilane functional groups, synthesized through a simple ring-opening reaction between 3-glycidyloxypropyltrimethoxysilane (KH560) and 4,4′-methylenebis (cyclohexylamine) (PACM), was applied to the surface of a transparent organic polymer to produce a robust, flexible, and transparent protective hybrid film, moisture cured at room temperature. The structure, morphology, and optical, mechanical, and thermal properties of the obtained hybrid film were evaluated. The hybrid film allowed the transmittance of more than 87% of visible light (at 600 nm), maintaining almost the same high transparency as bare PET film. The unique flexible segments and rigid segments in the inorganic–organic hybrid structure of the film realized superior resistance to bending and scratching. The hybrid film-coated PET demonstrated excellent flexibility, with an extremely low bending radius, illustrated by wrapping around a 1-mm mandrel bar without cracking. In addition, the hybrid film exhibited superior pencil hardness (of 2H) and excellent wear durability, i.e., no scratching after being subjected to 200 abrasion cycles using #0000 steel wool under a 19.6 kPa load. The robust, flexible, and transparent protective film developed here, and its simple and efficient preparation method, should have extensive application prospects. Note de contenu : - Materials
- Synthesis of the silane-terminated ambient-curable hybrid resin (ACHR)
- Fabrication of the hybrid film
- Characterization
- Scheme 1 : (a) Synthesis scheme of the hybrid resin ; and (b) fabrication scheme of the hybrid filmDOI : https://doi.org/10.1007/s11998-021-00460-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00460-y.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36212
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Development of flame-retardant waterborne polyurethane dispersions (WPUDs) from sulfonated phosphorus-based reactive water-dispersible agents / Dwij Dave in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Development of flame-retardant waterborne polyurethane dispersions (WPUDs) from sulfonated phosphorus-based reactive water-dispersible agents Type de document : texte imprimé Auteurs : Dwij Dave, Auteur ; Siddhesh Mestry, Auteur ; Shashank T. Mhaske, Auteur Année de publication : 2021 Article en page(s) : p. 1037–1049 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Composés organiques -- Synthèse
Dispersions et suspensions
Formulation (Génie chimique)
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Itaconique, Acide
Polymères ignifuges
Polyuréthanes
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : The current study presents an attempt to develop two molecules, namely sulfonated aromatic diol (SAD) and sulfonated aromatic diamine (SADAM), to induce flame retardancy, thermal stability, and dispersion ability for water-based polyurethane dispersions (WPUDs). The previously reported itaconic acid-based polyester polyol was used for prepolymer synthesis as well as for chain extension. Pre- and post-sulfonated compounds were subjected to characterization tests such as FTIR, 13C-NMR, 1H-NMR, and CHNS for confirmation of their structures. The standard dispersant used for the basis of comparison was commercially available dimethyl propionic acid (DMPA). WPUDs were synthesized in different molar concentrations of DMPA, SAD, and SADAM, and the covalent incorporation of all three molecules in the polymer backbone was confirmed by FTIR. The WPUD films were subjected to various thermal tests like TGA and DSC as well as mechanical tests like flexibility and pencil hardness. WPUD films obtained from SADAM showed a remarkable increase in Tg as well as char content. The THRI values for SAD- and SADAM-based films were better than DMPA-based films. SAD- and SADAM-based WPUD films also showed an increase in LOI value and UL-94 ratings with the maximum LOI value of 26. Dispersions based on DMPA showed better stability as compared to dispersions based on SAD and SADAM. Note de contenu : - MATERIAL AND METHODS : Materials - Synthesis of an aromatic diol (I-1) - Synthesis of aromatic diamine (I-2) - Sulfonation of I-1 and I-2Synthesis of WPUD - Characterization
- RESULTS AND DISCUSSION : CHNS analysis - Physicochemical analysis - FTIR and 1H-NMR analyse - Particle size and zeta potential analysis - Thermal properties - Mechanical properties - Flame-retardant properties
- Table 1 : Formulation used for WPUD synthesis
- Table 2 : UL-94 rating description
- Table 3 : Physicochemical analysis
- Table 4 : Particle size and zeta potential analysis
- Table 5 : Thermal properties of WPUD films
- Table 6 : Mechanical properties of WPUD films
- Table 7 : pH of WPUDs
- Table 8 : Onset and offset data of TGADOI : https://doi.org/10.1007/s11998-020-00458-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00458-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36213
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and characterization of UV-curable cellulose acetate butyrate-based oligomers and their cotton fabric coatings / Ozan Gazi Dehmen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Synthesis and characterization of UV-curable cellulose acetate butyrate-based oligomers and their cotton fabric coatings Type de document : texte imprimé Auteurs : Ozan Gazi Dehmen, Auteur ; Hacen Aysen Onen, Auteur ; Zehra Yildiz, Auteur ; Atilla Güngör, Auteur ; Yalcin Boztoprak, Auteur Année de publication : 2021 Article en page(s) : p. 1075–1085 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique)
Butyrate d'acétate de cellulose
Caractérisation
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
Essais (technologie)
Huile de coton
Oligomères
Perméabilité
Polymères -- Synthèse
Résistance thermique
Revêtements -- Propriétés mécaniques
Revêtements organiques
Textiles et tissusIndex. décimale : 667.9 Revêtements et enduits Résumé : In order to improve the thermal stability and flexibility, cellulose acetate butyrate (CAB) was modified with toluene diisocyanate–hydroxyethyl methacrylate (TDI–HEMA) adduct in various molar ratios. The obtained oligomer was characterized by proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared (FTIR) spectroscopies. Gloss, cross-hatch, contact angle, and Taber abrasion tests were all used to investigate the film forming performance of the modified CAB oligomers on glass plates. The UV-cured free films of the synthesized oligomers were examined in terms of the mechanical tests. By using the synthesized CAB oligomers, coating formulations were prepared and applied onto cotton fabrics in order to make the cotton fabrics more durable in outdoor environments. The existence of the coating layer on the fabric surfaces was investigated by scanning electron microscopy (SEM). The coated UV-cured fabrics were evaluated separately in terms of abrasion, thermal conductivity, and air and water vapor permeability properties. Results proved that the oligomer (50%-CAB) in which 50% of the hydroxyl groups of CAB were reacted with TDI–HEMA adduct showed the best mechanical properties with the highest tensile strength and modulus values. Considering the coated fabrics, the least deformation against abrasion, the highest air/water vapor permeability, and the best thermal conductivity were all recorded in 50%-CAB coated sample. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of modified CAB oligomers - Coating applications on cotton fabrics - Characterization
- RESULTS AND DISCUSSION : FTIR spectra - Film forming properties on glass layers - Mechanical properties of free films
- Table 1 : Sample codes with modification percentages
- Table 2 : Gloss, cross-hatch, and contact angle test results of samples on glass plates
- Table 3 : Mechanical properties of UV-cured free films of modified CAB oligomers
- Table 4 : Abrasion test results of coated UV-cured cotton fabrics for each formulation
- Table 5 : Clothing comfort properties of coated UV-cured cotton fabrics for each formulationDOI : https://doi.org/10.1007/s11998-020-00461-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00461-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36214
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characterization of polydimethylsiloxane containing cyano/phenyl groups for potential use in sorptive extraction / Miguel Angel Ávila-Martínez in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Preparation and characterization of polydimethylsiloxane containing cyano/phenyl groups for potential use in sorptive extraction Type de document : texte imprimé Auteurs : Miguel Angel Ávila-Martínez, Auteur ; Yamile Pérez-Padilla, Auteur ; Salvador Medina-Peralta, Auteur ; Alejandro Ávila-Ortega, Auteur ; David Muñoz-Rodríguez, Auteur Année de publication : 2021 Article en page(s) : p. 1087-1094 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Adsorption
Caractérisation
Composés organiques
Extraction (chimie)
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.
Polymères à silane modifié
Polymères organiques-inorganiques
Revêtements organiques
Sol-gel, Procédé
SulfonamidesIndex. décimale : 667.9 Revêtements et enduits Résumé : A coating of poly(dimethylsiloxane) (PDMS) on a stir bar is typically used for sorptive extraction and preconcentration of nonpolar organic analytes from aqueous matrices. Here, we used sol–gel to synthesize three new coatings based on hydroxy-terminated PDMS crosslinked with 3-cyanopropyltriethoxysilane (CN) and phenyltriethoxysilane (PH) with three molar ratios of CN:PH (2:1, 1:1, and 1:2). The water contact angle of the coatings was below 90°. Cyanopropyl and phenyl groups were identified by infrared spectroscopy. The coatings were thermally stable up to 200°C. Also, they were stable to organic solvents and aqueous solutions at different pH. Glass stir bars were covered with the coatings to explore its potential application in stir-bar sorptive extraction. The test included polar antibiotics (sulfathiazole, sulfamethoxazole, trimethoprim, and chloramphenicol) dissolved in spiked water (pH 4.5) and organic solvent. Different experimental conditions were used to explore the capacity of the coatings to extract and preconcentrate the antibiotics. Unsatisfactory results of enrichment effect were obtained in aqueous solutions of antibiotics. In organic medium, the antibiotics were extracted and preconcentrated with the three coatings. Note de contenu : - MATERIALS AND METHODS : Reagents and dissolutions - Preparation of stir bars with hybrid coating - Physicochemical characterization of the coatings - SBSE tests with coated stir bars - Experimental design and statistical analysis - Chromatographic analysis
- RESULTS AND DISCUSSION : Sol–gel synthesis of coatings - Characterization of hybrid coatings - Stability of coatings against solvents - Stability against pH conditions - Determination of water contact angle - Thermogravimetric analysis - SBSE tests with coated stir bars
- Table 1 : Reagent composition for the sol–gel preparation of the three in-house coatings
- Table 2 : Levels and factors used in 24 experimental design with five central points to evaluate the extraction of antibiotics by SBSE
- Table 3 Preconcentration factors for antibiotics (0 < log10KOW < 1.2) in SBSE extracts obtained in spiked isooctane. Extraction : 10 mL isooctane (spiked with 1 mg L−1), 250 rpm and 120 min. Desorption : vortex assisted, 40 min, 500 µL of 40% of MeOH–60% aqueous formic buffer solution (0.10% v/v, pH 4.5)DOI : https://doi.org/10.1007/s11998-021-00462-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00462-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36215
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Influence of zirconium(IV) in polyurethane based on hydroxyl telechelic natural rubber for coating application / Chatcha Phetthong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Influence of zirconium(IV) in polyurethane based on hydroxyl telechelic natural rubber for coating application Type de document : texte imprimé Auteurs : Chatcha Phetthong, Auteur ; Yeampon Nakaramontri, Auteur ; Sutida Marthosa, Auteur ; Ekasit Anancharoenwong, Auteur Année de publication : 2021 Article en page(s) : p. 1095-1107 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.
Caoutchouc
Métaux -- Revêtements protecteurs
Polyuréthanes
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements organiques
ZirconeLe dioxyde de zirconium ou oxyde de zirconium(IV) couramment appelée zircone est un composé inorganique du zirconium de formule ZrO2. Ce matériau est une céramique technique d'aspect opaque. Appelé CZ (Cubic Zirconia) lorsque transparent, il est utilisé pour imiter le diamant. Il ne faut pas le confondre avec le zircon (ZrSiO4). Sous sa forme tétragonale, l'oxyde de zirconium est un matériau a vocation mécanique, cette évolution cristallographique lui confère une dureté très élevée (1200Hv) ainsi qu'une bonne résistance aux sollicitations mécaniques (700Mpa en traction et 2000Mpa en compression). Une fois polie, la zircone tétragonale peut atteindre un Ra de 0,02, ce qui permet de l'utiliser pour des pièces de frottement.Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethane (PU) based on an eco-friendly renewable resource, namely hydroxyl telechelic natural rubber (HTNR), was in situ prepared using one-shot polymerization with zirconium(IV) oxide (ZrO2) incorporated. The modification of HTNR, preparation of PU together with the interactions of PU and ZrO2 surfaces were examined using FTIR, ATR-FTIR, and 1H-NMR. Also, the optimal ZrO2 content in PU matrix was used to coat carbon steel and the intrinsic properties of the composites were determined. It was found that tensile strength, Young’s modulus, hardness, abrasion resistance, and thermal stability of PU/ZrO2 composites increased with ZrO2 content, particularly at 2 wt% of ZrO2, owing to the homogeneous dispersion of ZrO2 throughout the PU matrix. After coating, the PU/ZrO2 composites showed good pencil hardness, adhesive performance, gloss, and wettability on the carbon steel substrate, enabling simple coating process and cost-effectiveness. Note de contenu : - EXPERIMENTAL : Materials - Preparation of hydroxyl telechelic natural rubber - (HTNR)Preparation of PU and PU/ZrO2 composites based on HTNR polyol
- CHARACTERIZATION : Fourier transform infrared spectroscopy - (ATR-FTIR)Nuclear magnetic resonance (1H-NMR)Tensile properties - Taber abrasion properties - Morphologies - Thermal properties - Coating properties
- RESULTS AND DISCUSSION : Hydroxyl telechelic natural rubber (HTNR)- Pure PU and PU/ZrO2 composites based
on HTNR polyol
- Table 1 : List of chemicals
- Table 2 : Peak assignments in ATR-FTIR spectra of the pure PU and ZrO2 particle
- Table 3 : Mechanical properties in terms of Young's modulus, 100% modulus, and hardness of pure PU and PU/ZrO2 composites-filled ZrO2 at 0.5–3.0 wt%
- Table 4 : Taber abrasion resistance of pure PU and PU/ZrO2 composites filled ZrO2 at 0.5–3.0 wt%
- Table 5 : Results from TGA thermograms of pure PU and PU/ZrO2 composites with various ZrO2 contents of 0.5–3.0 wt%
- Table 6 : Table 6: Coating properties in terms of hardness pencil, adhesion, and gloss of pure PU and PU/ZrO2 composites with various ZrO2 contents of 0.5–3.0 wt%
- Table 7 : Contact angle, surface energy, and work of adhesion of PU and PU/ZrO2 composites with various ZrO2 contents of 0.5–3.0 wt%DOI : https://doi.org/10.1007/s11998-021-00463-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00463-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36216
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characterization of a novel ultraviolet/thermal dual-curing thiol-ene/polyurethane acrylate coating / Dijun Huang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Preparation and characterization of a novel ultraviolet/thermal dual-curing thiol-ene/polyurethane acrylate coating Type de document : texte imprimé Auteurs : Dijun Huang, Auteur ; Yongxia Ren, Auteur ; Ruoning Yang, Auteur ; Zhiguo He, Auteur ; Youwei Yao, Auteur Année de publication : 2021 Article en page(s) : p. 1109-1116 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Copolymère uréthane acrylate
Dureté (matériaux)
Formulation (Génie chimique)
Photoréticulation
Réaction thiol-ène
Temps de séchageIndex. décimale : 667.9 Revêtements et enduits Résumé : A novel ultraviolet (UV)/thermal dual-curing thiol-ene/polyurethane acrylate (PUA) coating of PUA oligomer, tripropylene glycol diacrylate, 2,4,6-trimethylbenzoyldiphenyl phosphine oxide, and trimethylolpropane tris (3-mercaptopropionate) was prepared. The coating had a rapid surface drying rate with UV radiation (400 W, 50 W/cm2). For example, the surface of the novel thiol-ene/PUA coating dried within 3 s. The hardness, gel content, and initial decomposition temperature at 5 wt% weight loss of the UV/thermal dual-cured sample after 10 min of UV irradiation, followed by heating at 150°C for 20 min, were 37 D, 90.3%, and 302.2°C, respectively, which were higher than the 30 D, 87.7% and 284.9°C of the UV curing control after 10 min of UV irradiation. The curing time of the 1-mm-thick coating was 4.5 min in indoor sunlight (2.3 ± 0.3 mW/cm2) with a gel content of 83.8%. This coating could be applied in the rapid prototyping field with UV or sunlight exposure. Thermal treatment after UV curing could increase the crosslinking degree and influence the sample performance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of thiol-ene/polyurethane acrylate coatings - Preparation of cured samples - Characterization
- RESULTS AND DISCUSSION : FTIR characterization - Surface drying time with UV irradiation and curing time in sunlight - Gel fraction - Hardness - Thermal stability - Dynamic mechanical thermal performance
- Table 1 : Detailed formulations of coatings 1/2
- Table 2 : Surface drying time of coatings 1/2 with UV irradiation
- Table 3 : Actual curing time of coatings 1/2 in indoor sunlight
- Table 4 : Gel content of cured samples of thiol-ene/PUA coating 1
- Table 5 : Hardness of cured samples
- Table 6 : Thermal properties of different samples under Ar
- Table 7 : DMTA properties and crosslink density of thiol-ene/PUA-cured samplesDOI : https://doi.org/10.1007/s11998-021-00464-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00464-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36217
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Failure prediction of waterborne barrier coatings during folding / Yaping Zhu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Failure prediction of waterborne barrier coatings during folding Type de document : texte imprimé Auteurs : Yaping Zhu, Auteur ; Douglas W. Bousfield, Auteur ; William Gramlich, Auteur Année de publication : 2021 Article en page(s) : p. pages 1117-1129 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité)
Matériaux -- Propriétés barrières
Modèles techniques
Pliage (mécanique)
Revêtements -- Fissuration
Revêtements en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : Adding pigments into waterborne barrier coatings improves barrier properties and cost-effectiveness but increases the risk of crack formation during folding. Crack formation is affected by pigment shape, aspect ratio, and concentration; however, the exact mechanism for these effects is still not well understood. In this work, a systematic model was used to understand the influence of the paper and coating thickness, the latex and pigment modulus, the pigment shape and aspect ratio, and pigment concentration on the failure of waterborne barrier coatings during folding. A finite element method-based model was solved with a commercial package to simulate the folding process. These simulations were compared to experimental results to verify the key parameters that affect coating failure. High paper and coating thickness, pigment loadings, pigment aspect ratios, and modulus differences between latex and pigment increased the likelihood of failure. Experiments and models using lower modulus spherical plastic pigments were more difficult to fail than coatings made with higher modulus kaolin. The maximum strain for coatings bent to a set curvature was the smallest when the modulus of latex and pigment were similar. The model agreed closely with experimental results for two pigment types at various pigment loadings. Note de contenu : - METHODS : Model setup - Modeling general coating systems - Modeling experimental systems - Bending experiments - Comparing model and experimental results
- RESULTS AND DISCUSSION : Shape and aspect ratio effects - Modulus effects - Paper and coating thickness effects - Comparison of simulation and experiment
- Table 1 : Material properties in model
- Table 2 : Model parameters to compare to experimentsDOI : https://doi.org/10.1007/s11998-021-00465-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00465-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36218
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Applying pectin coatings enriched with antioxidant compounds as pre-treatment for kiwi (Actinidia deliciosa) drying process / Kaliana Sitônio Eça in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Applying pectin coatings enriched with antioxidant compounds as pre-treatment for kiwi (Actinidia deliciosa) drying process Type de document : texte imprimé Auteurs : Kaliana Sitônio Eça, Auteur ; Elaine Cristina Maciel Porto, Auteur ; Luciana de Siqueira Oliveira, Auteur ; Florencia Cecília Menegalli, Auteur Année de publication : 2021 Article en page(s) : p. 1131-1142 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antioxydants
Durée de vie (Ingénierie)
Enrobage (technologie)
Formulation (Génie chimique)
Fruits -- Revêtements protecteurs
Kiwi (fruit)
PectineLes pectines ou plus largement les substances pectiques, sont des polyosides, rattachées aux glucides. Ce sont des substances exclusivement d’origine végétale. Les pectines sont présentes en grande quantité dans les parois primaires des dicotylédones, et en particulier dans les parois végétales de nombreux fruits et légumes. Elles sont extraites industriellement des coproduits de l'industrie des jus de fruits, principalement des agrumes et en moins grande quantité des marcs de pomme.
- Composition chimique : Ce sont des polysaccharides caractérisés par un squelette d’acide α-D-galacturonique et de faibles quantités de α-L-rhamnose plus ou moins ramifiés. Le modèle généralement accepté décrit les pectines comme un enchaînement de deux structures majoritaires : une chaîne principale homogalacturonique (ou "zone lisse", dénommée HG) et une chaîne rhamnogalacturonique (ou "zone hérissée", dénommée RG).
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : One of the main drawbacks of drying fruits is the degradation of their quality by oxidative processes. In this study, antioxidant pectin coatings were prepared and applied onto kiwi slices before the drying process to evaluate their effect on drying kinetics, on maintaining nutritional quality and antioxidant capacity of the cut fruit, and during 31 days of storage. Pectin antioxidant coating formulations have been developed by adding antioxidant extracts from fruits or antioxidant acids. Uncoated dehydrated fruits and those coated with pectin without antioxidants were used as control. Convective drying was carried out, desorption isotherms (30, 50 and 60°C) and drying kinetics (50 and 60°C) were analyzed, and the obtained experimental data were adjusted to the GAB and Page models, respectively. The dried kiwi slices were evaluated for their retention of antioxidants (vitamin C and phenolic compounds), total antioxidant activity (DPPH), mechanical properties, and color. The coatings had a slight influence on the isotherms and drying kinetics at the studied temperatures, mainly for the one performed at 30°C. However, the drying rate at 60°C decreased more rapidly and the Page model fit well with the experimental data. The antioxidant coatings preserved the thermosensitive compounds during drying, and formulations with the acerola extract and antioxidant acids may be highlighted since, in addition to the antioxidant effect, they also nutritionally enriched the kiwi slices. Thus, the proposed methodology is a promising technique to reduce the oxidative effects inherent in the drying and storage processes. Note de contenu : - MATERIALS AND METHODS : Material - Processing
- RESULTS AND DISCUSSION : Desorption isotherms curves - Drying process - Coating characterization - Evaluation of kiwi slices after the drying process
- Table 1 : Composition (g/100 g) of fresh kiwi (A. deliciosa) at the maturation stage
- Table 2 : Pectin coating formulations
- Table 3 : Relative humidity of the saline solutions used for the sorption isotherm at 30, 50, and 60°C
- Table 4 : Parameters of the Page model and effective diffusivity estimated by the Fick model and the coefficient of determination for each drying test at 50 and 60°C
- Table 5 : Phytochemical compounds content and total antioxidant activity (TAA) of the coatingsDOI : https://doi.org/10.1007/s11998-021-00469-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00469-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36219
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Coating evaluation of polydimethylsiloxane-aminopropylsiloxane for stir bar sorptive extraction / David Muñoz-Rodríguez in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Coating evaluation of polydimethylsiloxane-aminopropylsiloxane for stir bar sorptive extraction Type de document : texte imprimé Auteurs : David Muñoz-Rodríguez, Auteur ; Yamile Pérez-Padilla, Auteur ; Alejandro Ávila-Ortega, Auteur ; Jesús Alberto Barrón-Zambrano, Auteur ; Cristian Carrera-Figueiras, Auteur Année de publication : 2021 Article en page(s) : p. 1143-1151 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
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.
Revêtements organiques
Sol-gel, ProcédéIndex. décimale : 667.9 Revêtements et enduits Résumé : In stir bar sorptive extraction (SBSE), a coating is typically used to isolate and preconcentrate organic compounds in aqueous samples. Here, a translucent coating based on polydimethylsiloxane and aminopropyltriethoxysilane was prepared by a sol–gel method. Characterization tests showed that the coating was homogeneous, relatively polar, and both thermally (≤ 400°C) and chemically stable. Coated stir bars were evaluated in SBSE experiments. Benzene derivatives and furanic compounds were successfully extracted/preconcentrated from aqueous and organic solutions. Furanic compounds and benzene derivatives were moderately extracted from water, but they were sufficiently extracted from isooctane Note de contenu : - MATERIALS AND METHODS : Materials - Coating and stir bar preparation - Thermogravimetric analysis (TGA)FTIR-ATR - Contact angle - Solvents and pH stability - SBSE experiments - Chromatographic analysis
- RESULTS AND DISCUSSION : Sol–gel synthesis - Scanning electron microscopy (SEM-EDS)FTIR-ATR - Thermogravimetric analysis - Water contact angle - Organic solvent and pH stability - SBSE results
- Table 1 : Elemental composition of the PDMS-APTES hybrid coating determined by SEM-EDS
- Table 2 : Furanic compound concentrations in an SBSE extract obtained from an aqueous solution using a PDMS-APTES-coated stir bar
- Table 3 : Furanic compound concentration in the SBSE extract obtained from organic solution using a PDMS-APTES-coated stir bar
- Table 4 : Residual concentration of furanic compounds in the organic solution after SBSE extraction with a PDMS-APTES-coated stir bar
- Table 5 : The concentrations of benzene and its derivates in an SBSE extract obtained from an aqueous solution using the PDMS-APTES-coated stir barDOI : https://doi.org/10.1007/s11998-021-00471-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00471-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36220
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Degradation of epoxy coatings exposed to impingement flow / Amin Vedadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Degradation of epoxy coatings exposed to impingement flow Type de document : texte imprimé Auteurs : Amin Vedadi, Auteur ; Xinnan Wang, Auteur ; M. Subbir Parvej, Auteur ; Quan Yuan, Auteur ; Fardad Azarmi, Auteur ; Dante Battocchi, Auteur Année de publication : 2021 Article en page(s) : p. 1153-1164 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes
Flux d'impact
Microscopie à force atomique
Revêtements -- Détérioration
Revêtements organiques
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Organic coatings are widely used for the corrosion protection of metals. Despite a wide range of work on the degradation of organic coatings, few studies have contributed to understand the influence of the fluid flow on the degradation of organic coatings. In this study, an epoxy coating is exposed to a vertical impingement flow of a 3.5 wt% NaCl solution with a variety of flow rates. The coating degradation is monitored by electrochemical impedance spectroscopy (EIS). Equivalent circuit models are employed to interpret the EIS spectra. Atomic force microscopy (AFM) was employed to study the influence of fluid flow on the surface topology of the coating samples. We found that the coating’s barrier property deteriorates more drastically when exposed to higher flow rates for impingement flow. Coating thickness and surface roughness are significantly affected by the fluid shear and the flow rate. It is concluded that the impingement flow substantially impacts the barrier properties of epoxy coatings owing to its influence on the electrochemical properties of the coating layers and the fluid shear it creates on the coating surface. Note de contenu : - MATERIALS AND METHODS : Corrosion test chamber and fluid circulation system - Materials and sample preparation - Experimental setup
- RESULTS AND DISCUSSION : EIS results - Equivalent circuit modeling - Topography characterization
- Table 1 : Coating thickness, capacitance, and total amount of 3.5 wt% NaCl solution (Mt) in a coating sample at different flow ratesDOI : https://doi.org/10.1007/s11998-021-00472-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00472-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36221
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Nanolatex technology 2 : blending polymer nanoparticles with conventional latexes for synergistic property improvement / Frank N. Jones in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Nanolatex technology 2 : blending polymer nanoparticles with conventional latexes for synergistic property improvement Type de document : texte imprimé Auteurs : Frank N. Jones, Auteur ; Ravi G. Joshi, Auteur ; Theodore Provder, Auteur ; Weidian Shen, Auteur Année de publication : 2021 Article en page(s) : p. 1165-1176 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Brillance (optique)
Dureté (matériaux)
Elasticité
Latex
Mélanges (chimie)
Nanoparticules
Polyacryliques
Revêtements organiques
SynergieIndex. décimale : 667.9 Revêtements et enduits Résumé : Results of our research on crosslinked latexes and polymer nanoparticles will be reported. Goals of this long-term program have been: comparing precoalescence and post-coalescence crosslinking; synthesizing polymer nanoparticle latexes (~ 20 to 25 nm) from a variety of acrylic monomers, including crosslinking and crosslinkable monomers; and blending nanoparticle latexes with compatible conventional (~ 120 to 130 nm) latexes and understanding their effects on film formation and on fundamental and empirical film properties. As we previously reported, blending conventional and nanolatexes in an 85/15 ratio (w/w of polymer solids) effects substantial changes of fundamental film properties. Best results included reducing minimum filming temperatures (MFT) while increasing Young’s moduli by factors of two to 17. Substantial improvements in empirical film properties such as gloss (up to 97 at 60°), hardness (increased by 2–5 pencils), block resistance, and adhesion to aluminum were also found. The previous report covered only a single blend ratio. Here we report studies of blends with ratios of conventional to nanoparticle latexes ranging from 92.5/7.5 to 30/70 (w/w). As before, the latexes and nanolatexes are BMA/BA copolymers with 0–4 wt.% of 1,3-butylene glycol dimethacrylate (precoalescence crosslinker) and 0–5 wt.% of diacetone acrylamide (for post-coalescence crosslinking with adipic dihydrazide). Films cast from these blends are subjected to everyday empirical coatings tests and are characterized using instrumental tests including dynamic mechanical analysis (DMA) and modulated differential scanning calorimetry (MDSC). Film formation and film morphology are studied using atomic force microscopy (AFM). The results confirm that blending nanoparticles at ratios up to 50/50 (w/w of polymer solids) can substantially improve certain properties of conventional latex films. For many properties, the optimum ratio is around 85/15 conventional/nano; a 92.5/7.5 ratio also affords substantial improvements. As coatings, the blends have near-zero VOC. Note de contenu : - INTRODUCTION : Plan of the present study
- EXPERIMENTAL : Materials - Conventional latex and nanoparticle latex characterization
- FILM PROPERTY STUDIES : RESULTS AND DISCUSSION : Studies of a range of blend ratios - Bulk film properties - Conjectures - Surface film properties
- Table 1 : Conventional latexes
- Table 2 : Nanoparticle latexes
- Table 3 : Selected properties of films cast from an 85/15 blend of thermoplastic conventional latex with a crosslinkable nanoparticle latex
- Table 4 : Blends of conventional and nanoparticle latexes
- Table 5 : Bulk film properties of films cast from blends of high Tg thermoplastic conventional latex and low Tg thermoplastic nanolatex
- Table 6 : Bulk film properties of films cast from blends of high Tg thermoplastic conventional latex and low Tg nanolatex with 5% external crosslinker
- Table 7 : Property comparison of blended latex with post-coalescence crosslinkable high and low Tg latexes
- Table 8 : Surface properties for films cast from all-thermoplastic latexes and blends
- Table 9 : Surface properties for films cast from all-thermoplastic latexes and crosslinkable nanolatexDOI : https://doi.org/10.1007/s11998-021-00474-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00474-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36222
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Development of multifunctional Si-Ca-PEG-nAg sol–gel implant coatings from calcium-2-ethoxyethoxide in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Development of multifunctional Si-Ca-PEG-nAg sol–gel implant coatings from calcium-2-ethoxyethoxide Type de document : texte imprimé Année de publication : 2021 Article en page(s) : p. 1177–1189 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 3-Glycidoxypropyltrimethoxysilane
Antibactériens
Argent
Calcium
Caractérisation
Chimie des surfaces
Couches minces
Implants médicaux
Matériaux hybrides
Polyéthylène glycol
Prothèses
Revêtements
Silicium
TitaneIndex. décimale : 667.9 Revêtements et enduits Résumé : Titanium implant success is compromised by microbial biofilms and aseptic loosening. This research aimed to develop robust multifunctional class II organic-inorganic hybrid coatings for implants with osteoconductive and antibacterial properties. 3-Glycidoxypropyltrimethoxysilane was coupled with organic polymer poly(ethylene) glycol-diamine (PEG-NH2) for integration into an inorganic sol backbone composed of tetraethoxysilane and calcium, which was sourced from newly synthesized calcium-2-ethoxyethoxide. Nuclear magnetic resonance and attenuated total reflectance Fourier transform infrared spectroscopy confirmed synthesis of precursors and the structure of coating constituents. Scanning electron microscopy and energy-dispersive X-ray spectroscopy (EDS) demonstrated homogenous coatings, micro-topographical surface features, and apatite-like ex vivo mineralization in simulated body fluid. Tensile adhesion testing demonstrated robust and highly adherent (15.1 ± 3.3 MPa) coatings on titanium substrates. Hybrid coatings imbedded with silver nanoparticles (nAg) significantly inhibited (P < 0.05) Staphylococcus aureus and Escherichia coli planktonic cultures and biofilm formation. These Si-Ca-PEG-nAg hybrid coatings for titanium implants offer robust multifunctional features. Note de contenu : - MATERIALS AND METHODS : Preparation of coating materials - Characterization of coatings
- RESULTS AND DISCUSSION : Materials characterization
- Table 1 : Composition of hybrid coatings
- Table 2 Ionic composition of simulated body fluid and human blood plasmaDOI : https://doi.org/10.1007/s11998-021-00477-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00477-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36223
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Polycaprolactone tridentate ligand corrosion inhibitors coated on biodegradable Mg implant / Hamouda M. Mousa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Polycaprolactone tridentate ligand corrosion inhibitors coated on biodegradable Mg implant Type de document : texte imprimé Auteurs : Hamouda M. Mousa, Auteur ; Mahmoud A. Mahmoud, Auteur ; Ahmed S. Yasin, Auteur ; Ibrahim M. A. Mohamed, Auteur Année de publication : 2021 Article en page(s) : p. 1191-1197 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Caractérisation
Implants orthopédiques
Ligands
Magnésium -- Alliages
Métaux -- Revêtements protecteurs
Poly-e-caprolactone
Revêtement par centrifugation
Revêtements organiques
Tissu osseuxIndex. décimale : 667.9 Revêtements et enduits Résumé : Magnesium (Mg) is widely used in different tissue engineering applications such as bone fracture fixations and cardiovascular stent applications. However, it exhibits high degradation properties in the physiological medium and hence loses its mechanical properties. Herein, AZ31 Mg alloy was spin-coated with polycaprolactone (PCL) polymer blended with Schiff base derived from amino acid as a corrosion inhibitor. Coated samples were characterized using field emission electron microscopy (FESEM) and Fourier-transform infrared spectroscopy (FTIR) analysis. Additionally, corrosion behavior was evaluated using electrochemical potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Moreover, the bioactivity of the studied samples was confirmed in vitro with MC3T3-E1 osteoblasts cells. Results show that coated samples with corrosion inhibition efficiency of blended PCL and L-isoleucine Schiff (PCL-SI) reached 66% compared to that of pure PCL 39%. This suggests that the introduced materials were superior to control biodegradability and biocompatibility of the bare alloy in bone tissue engineering application. Note de contenu : - Table 1 : Summary of electrochemical corrosion test DOI : https://doi.org/10.1007/s11998-021-00478-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00478-w.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36224
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22969 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |