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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Influence of surface modification on thermal, adhesive properties and impact behavior of TPU films for laminated glass / Chenxing Zhang in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 3 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 3 (2022) . - p. 329-337 Titre : Influence of surface modification on thermal, adhesive properties and impact behavior of TPU films for laminated glass Type de document : texte imprimé Auteurs : Chenxing Zhang, Auteur ; Hongwu Wu, Auteur ; Liangfeng Xu, Auteur ; Mingyuan Ren, Auteur Année de publication : 2022 Article en page(s) : p. 329-337 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Caractérisation Essais d'adhésion Essais de résilience Essais dynamiques Films adhésifs Films plastiques Films plastiques -- Propriétés mécaniques Polyuréthanes Stabilité thermique Traîtements de surface Verre -- Revêtements Index. décimale : 668.4 Plastiques, vinyles Résumé : The poor adhesion of TPU films limits their extensive application in lightweight laminated glass (LLG). A simple and effective method is reported in this paper to obtain modified TPU films by silane coupling agent (SCA) treatment. The polar groups (such as urethane groups, carboxyl groups, etc.) on the surface of TPU films reacted chemically with the reactive groups of SCA. Meanwhile, hydrogen bonds were formed between the silicon hydroxyl groups generated by the hydrolysis of SCA. Therefore, the adhesivity and thermal stability of TPU films were improved. Moreover, the surface of TPU films became rough after modification, hence the interfacial bonding area between TPU film and glass increased, which furthered the bonding effect of TPU film with glass plate. Compared with unmodified TPU films, the tensile shear bond strength (TSBS) of modified TPU films increased by nearly 28%, and the initial decomposition temperature increased from 277 °C to a maximum of 295.3 °C. The impact resistance of LLG was significantly improved due to the improvement of the adhesivity of TPU film. Note de contenu : - EXPERIMENTAL : Materials and instruments - Preparation of TPU film - Surface modification of TPU film - Adhesion test and sample preparation - Impact test and sample preparation - Characterization of modified TPU film - RESULTS AND DISCUSSION : FT-IR analysis - Thermogravimetric analysis - SEM microstructure of TPU film - Adhesive properties of TPU film - Impact properties of LLG - Table 1 : Surface modified TPU film samples. A1, A2 and A3 represent hydrolysis time of 2h, 4h and 6h, respectively. B1, B2 and B3 represent ultrasonic treatment time of 2 min, 4min and 6min, respectively - Table 2 : Different decomposition temperature of modified TPU film DOI : https://doi.org/10.1515/ipp-2022-0001 En ligne : https://drive.google.com/file/d/159a_u_N73b5qCKhSShmLt4x1sqZ-mc3k/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37910 [article]

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