A comparative study of grafting steps on the preparation and properties of modified nanosilica for UV-curable coatings / Jianbing Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 5 (09/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 5 (09/2014) . - p. 717-726 Titre : A comparative study of grafting steps on the preparation and properties of modified nanosilica for UV-curable coatings Type de document : texte imprimé Auteurs : Jianbing Wu, Auteur ; Lixia Ling, Auteur ; Guozhang Ma, Auteur ; Baojun Wang, Auteur Année de publication : 2014 Article en page(s) : p. 717-726 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylsilane Greffage (chimie) Nanoparticules Réticulation (polymérisation) Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultraviolet Silice La 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. Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Nanosilica was modified and functionalized with acrylsilane by the “grafting to” method via different grafting steps, i.e., prepared-grafting step and step-wise propagation. The prepared-grafting step was achieved by grafting the nanosilica surface with the prepared acrylsilane, which was obtained by thiol-ene click reaction between 3-mercaptopropyl trimethoxysilane (MPTMS) and trimethylolpropane triacrylate (TMPTA). The step-wise propagation was achieved by first grafting MPTMS onto the nanosilica surface and then using the mercapto groups as initiators to react with TMPTA. The acrylsilane was characterized by FTIR. The modified nanosilica was characterized by FTIR, TGA, and contact angle analysis. It was demonstrated that the thiol-ene click reaction can easily occur between MPTMS and TMPTA. The grafting ratio of modified nanosilica via prepared-grafting step was higher than that of step-wise propagation. The SEM images of fractured films containing modified nanosilica also indicated that the former is more effective than the latter in reducing the self-aggregation of nanosilica. The effects of modified nanosilica on the viscosity and hardness of UV-curable coatings were also investigated. Note de contenu : - EXPERIMENTAL : Materials - Grafting acrylsilane to nanosilica surface via prepared-grafting step - Grafting acrylsilane to the nanosilica surface via step-wise propagation - Preparation of UV-curable coatings - Characterizations and measurements - RESULTS AND DISCUSSION : Preparation and characterization of acrylsilane - The difference in preparation of modified nanosilica via different steps - The dispersion of modified nanosilica in the UV-curable coatings - Effect of modified nanosilica on the viscosity of UV-curable coatings - Effect of modified nanosilica on the hardness of UV-curable coatings DOI : 10.1007/s11998-014-9593-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9593-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22054 [article]

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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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 1 (01/2021) . - p. 183-192 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 Silice La 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 particules Index. 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 films DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35362 [article]

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Effects of glycidyl methacrylate content and addition sequence on the acrylic latexes with carboxyl groups / Guofeng Qin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 6 (11/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 6 (11/2016) . - p. 973-980 Titre : Effects of glycidyl methacrylate content and addition sequence on the acrylic latexes with carboxyl groups Type de document : texte imprimé Auteurs : Guofeng Qin, Auteur ; Guozhang Ma, Auteur ; Caiying Hou, Auteur ; Jianbing Wu, Auteur ; Tingfa Yi, Auteur ; Ruofei Zhang, Auteur ; Hui Zhang, Auteur ; Xiaogang Hao, Auteur Année de publication : 2016 Article en page(s) : p. 973-980 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Groupement carboxyle Latex Méthacrylate de glycidyle Polyacryliques Polymères -- Synthèse Polymérisation en émulsion Réticulation (polymérisation) Index. décimale : 667.9 Revêtements et enduits Résumé : Acrylic latexes with epoxy and carboxyl groups have been synthesized via a two-stage emulsion polymerization process. Different contents of glycidyl methacrylate (GMA) were introduced by three addition modes to copolymerize with methyl methacrylate, butyl acrylate, acrylic acid (AA) in the presence of K2S2O8. To obtain stable latexes, NaHCO3 was employed as a buffer to compensate for the acidity from the thermal dissociation of K2S2O8, and triethylamine was used to neutralize the carboxyl acid from AA. The results showed that the stable latexes with core/shell structure were synthesized by this method, and higher GMA content or addition at earlier stage led to forming the latexes with higher content of coagulum and bigger sized particles. During the formation of films, the polymer epoxy groups underwent the crosslinking reaction with carboxyl acid. When the GMA content increased or GMA was introduced at a later stage, high crosslinking extent was formed in the films. As a result, the crosslinking provided the films with improved water resistance, chemical resistance, tensile strength, hardness, abrasion resistance, and thermal stability. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of acrylic latexes - Preparation of acrylic films - Measurements and characterization - RESULT AND DISCUSSION : Effect of the GMA on the properties of the latexes - Effect of GMA on the properties of the latex films DOI : 10.1007/s11998-016-9808-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9808-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27244 [article]

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Epoxy functionalization of multiwalled carbon nanotubes for their waterborne polyurethane composite with crosslinked structure / Shaohui Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 91-100 Titre : Epoxy functionalization of multiwalled carbon nanotubes for their waterborne polyurethane composite with crosslinked structure Type de document : texte imprimé Auteurs : Shaohui Wang, Auteur ; Huafeng Duan, Auteur ; Guozhang Ma, Auteur ; Caiying Hou, Auteur ; Jianbin Wu, Auteur ; Shasha Li, Auteur ; Ziyuan Yang, Auteur ; Xiaogang Hao, Auteur Année de publication : 2020 Article en page(s) : p. 91-100 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Caractérisation Composites -- Propriétés mécaniques Conduction électrique Epoxydes Nanotubes de carbone à parois multiples Un 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. Polymères en émulsion Polyuréthanes Résistance à l'humidité:Résistance à l'eau Réticulation (polymérisation) Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : In order to achieve covalent bond between multiwalled carbon nanotubes (MWCNTs) and waterborne polyurethane (WPU), pristine MWCNTs were first oxidized by strong acids and then underwent ring-opening reaction with epoxy resin to chemically attach epoxy moiety onto their surface. For fabrication of the MWCNTs/WPU composite, the epoxy moiety facilitates the dispersion of MWCNTs in the polymer matrix and could react with carboxylic acid or amine groups in the WPU macromolecules to form a crosslinked structure in their composite, resulting in a great improvement in their mechanical property, thermal stability, water resistance, and electrical conductivity. As the content of MWCNTs reached 1.5 wt%, the tensile strength of functionalized MWCNTs composite was improved by about 108% and the electrical conductivity was increased by six orders of magnitude compared to that of the pristine MWCNTs composite. Note de contenu : - EXPERIMENTAL : Materials - Preparation of epoxy-functionalized MWCNTs - Synthesis of WPU and fabrication of MWCNTs/WPU composites - Characterization - RESULTS AND DISCUSSION : Characterization of the functionalized MWCNTs - Mechanical properties of MWCNTs/WPU composites - Dynamic mechanical properties of MWCNTs/WPU composites - Dispersion and interfacial adhesion of MWCNTs in/with WPU matrix - Water resistance of MWCNTs/WPU composites - Thermalstability of MWCNTs/WPU composites - Electrical conductivity properties of MWCNTs/WPU composites DOI : 10.1007/s11998-019-00242-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00242-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33730 [article]

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Preparation, properties and application of waterborne hyydroxyl-functional polyurethane/acrylic emulsions in two-component coatings / Guozhang Ma in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 3 (05/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 3 (05/2015) . - p. 505-512 Titre : Preparation, properties and application of waterborne hyydroxyl-functional polyurethane/acrylic emulsions in two-component coatings Type de document : texte imprimé Auteurs : Guozhang Ma, Auteur ; Taotao Guan, Auteur ; Caiying Hou, Auteur ; Jianbing Wu, Auteur ; Gang Wang, Auteur ; Xuan Ji, Auteur ; Baojun Wang, Auteur Année de publication : 2015 Article en page(s) : p. 505-512 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Caractérisation Copolymère uréthane acrylique Copolymères en émulsion Dureté (matériaux) Matériaux hybrides Mouillabilité Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements bi-composant:Peinture bi-composant Index. décimale : 667.9 Revêtements et enduits Résumé : A serious of waterborne hydroxyl-functional polyurethane/acrylic (PUA) emulsions for two-component coatings was prepared by copolymerizing different weight ratios of hydroxyethyl acrylate (HEA)/butyl acrylate (BA) with methyl methacrylate and acrylic-terminated polyurethane dispersion via an emulsion process. The results showed that increasing the weight ratio of HEA/BA led to a decrease in the average particle sizes and a narrowing in the particle size distribution, but an increase in the viscosity of their emulsions. Meanwhile, their films showed increased thermal resistance, adhesion on substrate, tensile strength, and hardness, but decreased water resistance and enhanced wettability. When the emulsions were applied in two-component coatings, their water resistance was greatly improved and the wettability was reduced; in addition, their glass transition temperature, thermal stability, adhesion on substrate, tensile strength, and hardness were further increased. It was suggested that hydroxyl groups of PUA can not only engage in the intramolecular and/or intermolecular hydrogen bonding, but also form covalently crosslinked networks with polyisocyanate in their films. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PUA hybrid emulsions - Application in two-component coatings and preparation of their films - Measurements and characterization - RESULTS AND DISCUSSION : The performance of PUA hybrid emulsions - The FTIR and thermal behaviors of the films - The water wettability and water absorption of the films - The adhesion of the coatings - The mechanical properties and hardness of the films DOI : 10.1007/s11998-014-9647-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9647-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24174 [article]

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Surface modification of nanosilica with 3-mercaptopropyl trimethoxysilane and investigation of its effect on the properties of UV curable coatings / Jianbing Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 6 (11/2013)  

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Surface modification of nanosilica with acrylsilane-containing tertiary amine structure and their effect on the properties of UV-curable coating / Jianbing Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)  

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Synthesis of fluorinated polyacrylic acrylate oligomer for the UV-curable coatings / Jianbing Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

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