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Castor oil-based waterborne hyperbranched polyurethane acrylate emulsion for UV-curable coatings with excellent chemical resistance and high hardness / Daidong Wei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)
[article]
Titre : Castor oil-based waterborne hyperbranched polyurethane acrylate emulsion for UV-curable coatings with excellent chemical resistance and high hardness Type de document : texte imprimé Auteurs : Daidong Wei, Auteur ; Bing Liao, Auteur ; Qiwen Yong, Auteur ; Huiyi Wang, Auteur ; Tao Li, Auteur ; Jianheng Huang, Auteur ; Hao Pang, Auteur Année de publication : 2019 Article en page(s) : p. 415-428 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Copolymère uréthane acrylate
Dureté (matériaux)
Formulation (Génie chimique)
Huile de ricin et constituants
Humidité -- Absorption:Eau -- Absorption
Polyesters
Polymères -- Synthèse
Polymères en émulsion
Résistance chimique
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements en phase aqueuse
Rhéologie
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : Synthesis, characterization, and coating performance of castor oil (CO)-based waterborne hyperbranched polyurethane acrylate (WHPUA) emulsions are highlighted in this work. Herein, a second-generation CO-based hyperbranched polyester (C20) was synthesized by introducing the renewable CO as a B3 core and dimethylolpropionic acid as an AB2 monomer via a pseudo-one-pot condensation procedure. Three types of CO-based WHPUA emulsions were prepared through the addition of the hyperbranched C20 with maleic anhydride (MA) and the isocyanate-bearing semiadduct (IPDI-HEA) at different MA/IPDI-IH molar ratios without the addition of any emulsifiers. The prepared emulsions were further formulated into UV-curable coating formulations and exposed to a medium-pressure mercury lamp. Consequently, the obtained UV-cured coatings exhibited outstanding adhesion performance, excellent transparency, and an acceptable degree of final double bond conversion. Owing to a relatively low concentration of hydrophilic units and a large number of acrylate functionalities in the waterborne oligomer, the obtained films were endowed with high crosslinking density and low hydrophilic nature, thus producing enhanced tensile strength, pencil hardness, water resistance, and chemical resistance. Due to their combination of renewable materials, a waterborne system and a UV-curing technique, these CO-based WHPUA emulsions offer promising opportunities to be used as environmentally friendly coatings. Note de contenu : - EXPERIMENTAL : Materials - Materials - Synthesis of the second-generation hyperbranched polyester (C20) - Synthesis of the CO-based WHPUA emulsions (WCM&.5I8.5s WCM2I88, and WCM2.4I7.5) - UV-curable coating formulations and UV-curing - Characterization
- RESULTS AND DISCUSSION : Synthesis and structure characterization - Appearance, stability, viscosity, and particle diameter distribution - Rheological behavior - Curing kinetics and boule bond conserson - Mechanical properties and performance of the UV-cured coatings - Gel content and water absortion of the UV-cured films - Chemical resistance of the UV-cured films - Thermal properties and transparency of the UV-cured films
- COMPLIANCE WITH ETHICAL STANDARDSDOI : 10.1007/s11998-018-0120-1 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32413
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 415-428[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20894 - Périodique Bibliothèque principale Documentaires Disponible Characterization and corrosion protection properties of composite material (PANI+TiO2) coatings on A304 stainless steel / Souhila Abaci in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 1 (01/2015)
[article]
Titre : Characterization and corrosion protection properties of composite material (PANI+TiO2) coatings on A304 stainless steel Type de document : texte imprimé Auteurs : Souhila Abaci, Auteur ; Belkacem Nessark, Auteur Année de publication : 2015 Article en page(s) : p. 107-120 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable
AcierL'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.
Anticorrosifs
Anticorrosion
Caractérisation
Dioxyde de titane
Métaux -- Revêtements protecteurs
pH
Polyaniline
Résistance chimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : This work presents the corrosion protection behavior of A304 stainless steel in an acidic medium by using coatings based on polyaniline+TiO2 composite material. The influence of parameters such as concentration of aniline, TiO2 content, and pH of the solution were investigated. The coatings which had been deposited by cyclic voltammetry on substrates of A304 steel were then characterized by electrochemical impedance spectroscopy. The cyclic voltammograms showed three redox couples characteristic of the different oxidation and reduction states of the produced polymer. PANI+TiO2 composite material was observed to exhibit higher corrosion resistance and better properties. The effectiveness of coatings in preventing corrosion was tested by potentiodynamic polarization studies and scanning electron microscopy was used to characterize the morphology of the coatings. The results showed that PANI+TiO2 coatings offer good anticorrosion protection to steel in 1 M H2SO4 solutions. The micrograph taken at the coatings surface showed that (PANI+TiO2)/A304 composite was uniform in nature and TiO2 particles were uniformly covered by PANI. After immersion into a corrosive solution for 45 min, no aggressive effect was observed and the coating films were still present. Moreover, the formation of PANI+TiO2 composite was also confirmed by EDX. Furthermore, it was found that the presence of a low amount of TiO2 in PANI coatings afforded the best protection due to the formation of a coating layer on the metallic surface which behaved like a physical barrier against the aggressive medium attack. Note de contenu : - EXPERIMENTAL : Materials - Methods and electrodeposition of PANI+TiO2 composite film - Characterization techniques
- RESULTS AND DISCUSSION : Electropolymerization of aniline in H2SO4 environment on an A304 stainless steel electrode - Effect of TiO2 content in the film deposited on 1304 stainless steel - Effect of the aniline concentration on stainless steel - Protection of the stainless steel by the polyaniline modified by the incorporation of TiO2 (Tafel polarization curves) - Study by impedance spectroscopy of the electrode modified (PANI+TiO2)/A304 - Morphological characterizaton of the steel, PANI, and composite films by SEM - Chemical analysis of the composites by EDXDOI : 10.1007/s11998-014-9611-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9611-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23211
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 1 (01/2015) . - p. 107-120[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16952 - Périodique Bibliothèque principale Documentaires Disponible Characterization of fatty acid based self-crosslinking poly(urethane urea) anionomers : morphological perspective / Ashish Patel in PAINTINDIA, Vol. LXII, N° 10 (10/2012)
[article]
Titre : Characterization of fatty acid based self-crosslinking poly(urethane urea) anionomers : morphological perspective Type de document : texte imprimé Auteurs : Ashish Patel, Auteur ; Ashok Dighe, Auteur Année de publication : 2012 Article en page(s) : p. 51-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides gras
Caractérisation
Copolymère uréthane-urée
Couches minces
IonomèresUn ionomère est un copolymère thermoplastique « réticulé ioniquement ». La réticulation améliore la cohésion du polymère et la conductivité électrique.
Résistance chimique
Réticulation (polymérisation)
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : Fatty acid based self-crosslinking polyurethane urea (PUU) anionomers can find potential applications in coatings field due to enhanced chemical resistance properties. To optimize their performance in coatings, the molecular features that influence the microphase morphology and dynamic mechanical (DM) behavior of polymer films must be understood and exploited. In this work, comprehensive materials characterization of model PUU anionomers films with oxidative-crosslinking microstructure is addressed. For this, linoleic fatty acid based precursor (LPE) was included in polymer backbone which provides reactive sites for autooxidative polymerization. Three series of compositions were prepared with urea content of 8.4 %, 13.2 % and 18.1 % where within each series LPE content has been increasing in same proportion. Different experimental techniques like FTIR, DSC, DMA and mechanical testing were utilized to study the effect of compositional variables on the extent of phase segregation, domain structure and mechanical properties of fully cured polymer samples. The extent soft segment (SS) oxidative crosslinking had market effect on the microphase morphology and DM properties of materials of lowest urea content. Significant phase mixing was observed with evolvement of single heterogenous phase in the sample with highest LPE content. Samples with 13.2 % urea shows less sensitivity towards increased SS crosslinking in their microphase morphology change. Their mechanical and DM properties were observed to be dominated by interlocked hard domains. With higher urea content, such kind of hard segment cohesion results due to greater strength of bidenate H-bonding among urea linkages. While samples with highest % urea, were clearly found to be well microphase separated compared to other two series with highest HS interconnectivity and have marginal effect of extent of SS crosslinking on microphase separation. This study gives an insight about effect of extent of complex oxidative crosslinking on the microphase separation. This study gives an insight about effect of extent of complex oxidative crosslinking on the microphase separation and DM behavior of segmented PUU anionomers based films with different urea content which is useful in designing such materials in coating system with specific surface structure and function. Note de contenu : - MATERIALS
- METHODS : Preparation of fatty acid modified PUDs - Preparation of films - Instrumental analysis
- FOURIER TRANSFORM INFRARED SPECTROSCOPY
- THERMAL ANALYSIS
- DYNAMIC MECHANICAL : Effect on the storage modulus - Effect on loss factor (tan delta)
- MECHANICAL PROPERTIESPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16265
in PAINTINDIA > Vol. LXII, N° 10 (10/2012) . - p. 51-62[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14240 - Périodique Bibliothèque principale Documentaires Disponible Charge-air ducts in modern engines / Martin Völker in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 3 (03/2013)
[article]
Titre : Charge-air ducts in modern engines Type de document : texte imprimé Auteurs : Martin Völker, Auteur Année de publication : 2013 Article en page(s) : p. 33-36 Langues : Anglais (eng) Catégories : Automobiles -- Moteurs -- Pièces
Matières plastiques dans les automobiles
Polyamide 6
Résistance chimique
Résistance thermiqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : Polyamides - High temperatures and pressures, as well as attack by chemical substances push the engineering plastics used in modern engines to their limits. In addition to the classic loads, even higher temperatures and, most of all, potential acid attack results from exhaust gas return and turbocharging. Are the materials up to all this? This article provides an answer. Note de contenu : - Reducing pollutants
- Heat and chemical resistantEn ligne : http://www.plasticsportalasia.net/wa/plasticsAP~en_GB/function/conversions:/publ [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18125
in KUNSTSTOFFE INTERNATIONAL > Vol. 103, N° 3 (03/2013) . - p. 33-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14819 - Périodique Bibliothèque principale Documentaires Disponible Chemical durability of silylated polyurethane-based formulations / Patrice Lehmann in ADHESIVES AGE, Vol. 41, N° 1 (01/1998)
[article]
Titre : Chemical durability of silylated polyurethane-based formulations Type de document : texte imprimé Auteurs : Patrice Lehmann, Auteur ; Robert R. Johnston, Auteur Année de publication : 1998 Article en page(s) : p. 28-32 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Formulation (Génie chimique)
Immersion
Joints d'étanchéité
Mastics
Polyuréthanes
Produits d'étanchéité
Résistance chimique
Silanes organofonctionnels
solvantsIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : Witco Silquest silanes and SPUR technology are designed to allow for tailor-made prepolymers suitable for low to high modulus formulations with identified benefits such as improved UV stability/weatherability and adhesion performance.This study of chemical resistance leads to the conclusion that the inherent benefits of durable siloxane bonding -well-known and anticipated for various coatins applications- extends to silylated polyurethane-(SPU)based sealants. Apparently the synergy of the siloxane crosslinking and the polyurethane chemistry enhances the chemical resistance of these kinds of SPU-based sealants products. The model sealant formulations SPU A and SPU B revealed integrity towards chemical attack when compared to representative commercially available sealants. Immersion in solvents such as diesel fuel, transmission oil and anti-freeze for prolonged periods of time, even at elevated temperature, resulted in minimal changes in mechanical properties when compared to all other representative candidates types of sealants. This result make them particularly suitable for the automotive area such as engine compartment applications.
Whereas all other sealants revealed at last one solvent as particularly problematic, the SPU-based products show the greatest range of chemical resistance over all mechanical properties measured. Generally all these sealants excluding SPU-based products had a significant problem maintaining integrity of modulus.
Sealants based on SPUR technology show the best performance in regard to chemical resistance as a function of temperature.
To further verify these findings other SPU-base laboratory sealants are being added to this evaluation program. This work will extend to adhesion performance tested afeter solvent exposure. The synergy of both improved adhesion performance and good chemical resistance is expected to result in further meaningful benefits.Note de contenu : - EXPERIMENTAL : Preparation of silylated polyurethane resins - Sealant preparation
- COMMERCIALLY AVAILABLE SEALANT COMPARISONS :
- SAMPLE PREPARATION AND TESTINGEn ligne : https://drive.google.com/file/d/1tZSIwEZCvTS1ucYn15auZbClAZKTTKga/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20135
in ADHESIVES AGE > Vol. 41, N° 1 (01/1998) . - p. 28-32[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001084 - Périodique Bibliothèque principale Documentaires Exclu du prêt Chemical resistance of bio-additives in epoxy tank coatings / Eric B. Williams in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 202, N° 4574 (07/2012)
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