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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 4 (07/2021) . - p. 989–998 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 Thermogravimétrie Index. 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 films DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36207 [article]

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