Preparation and characterization of cationic waterborne polyurethanes containing a star-branched polydimethylsiloxane / Xiaoling He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1055-1066 Titre : Preparation and characterization of cationic waterborne polyurethanes containing a star-branched polydimethylsiloxane Type de document : texte imprimé Auteurs : Xiaoling He, Auteur ; Jingwei He, Auteur ; Yangkun Sun, Auteur ; Xiaopei Zhou, Auteur ; Jingying Zhang, Auteur ; Fang Liu, Auteur Année de publication : 2022 Article en page(s) : p. 1055-1066 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dépôt électrolytique Polydiméthylsiloxane Le 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 -- Propriétés mécaniques Polymères -- Synthèse Polymères cationiques Polymères en émulsion Polymères ramifiés Polyuréthanes Résistance à l'humidité:Résistance à l'eau Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Cationic waterborne polyurethanes (CWPUs) bring in hydrophilic component to molecular chain, which inevitably deteriorates its water-resistant ability. Here, we synthesized a series of branched chain cationic waterborne polyurethanes (i.e., CWPUs-Si) that had been modified using a novel star-branched polydimethylsiloxane (SB-PDMS) to improve their water-resistant performance. The effects of SB-PDMS content on the properties of the CWPUs-Si polymers (e.g., crystallinity, emulsion stability, mechanical performance, surface element enrichment, surface topography, water resistance), together with the performance of coatings prepared by cathodic electrodeposition, were determined. The results showed that the introduction of SB-PDMS increased phase separation and surface roughness induced by hydrogen bonding while the surface energy decreased, both of which improved water resistance. The polymers showed improved rigidity due to increased content of the hard segments and enhanced physical crosslinking. Except for an increase in pencil hardness, SB-PDMS had no effect on the films prepared by cathodic electrodeposition. The results from this study may provide a strategy to improve the water-resistant properties of CWPUs. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of CWPUs-Si - Preparation of CWPUs-Si cast films and CED coatings - Characterization - RESULTS AND DISCUSSION : Synthesis and characterization of CWPUs-Si - Emulsion properties of the CWPUs-Si polymers - Surface element analysis of CWPUs-Si - Surface topography of CWPUs-Si - Water resistance of CWPUs-Si - Mechanical properties of CWPUs-Si - Properties of CED coatings prepared from the CWPUs-Si polymers - Table 1 : The composition design of CWPUs-Si - Table 2 : Table 2 Emulsion properties of CWPUs-Si polymers - Table 3 : Atomic mass contents of CWPUs-Si polymers DOI : https://doi.org/10.1007/s11998-021-00584-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00584-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38035 [article]

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Synthesis and characterization of cathodic electrodeposition coatings based on octadecyl-modified cationic waterborne polyurethanes / Xiaoling He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 5 (09/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 5 (09/2020) . - p. 1255–1268 Titre : Synthesis and characterization of cathodic electrodeposition coatings based on octadecyl-modified cationic waterborne polyurethanes Type de document : texte imprimé Auteurs : Xiaoling He, Auteur ; Zhang Yu, Auteur ; Jingwei He, Auteur ; Fang Liu, Auteur Année de publication : 2020 Article en page(s) : p. 1255–1268 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Chaînes latérales octadécyl Dépôt électrolytique Hydrophobie Polymères -- Synthèse Polymères cationiques Polymères en émulsion Polyuréthanes Revêtements en phase aqueuse Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Aimed at increasing the hydrophobicity of cathodic electrodeposition (CED) coatings based on cationic waterborne polyurethanes (WPUs), a series of cationic WPUs with hydrophobic octadecyl side chains were successfully synthesized by introducing 1-monostearoyl-rac-glycerol as a diol chain extender. ATR-FTIR spectra and SEM images showed the degree of phase separation between soft segments and hard segments of cationic WPUs clearly increased by incorporating octadecyl groups. The water contact angle and water absorption studies showed that the water-resistance property of modified CED coatings was obviously enhanced because of the incorporation of a low surface energy unit and the formation of a more sophisticated surface induced by hydrogen bonds. The International Standardization test of paints and varnishes revealed that the CED films possessed excellent hardness, adhesion, flexibility, and impact resistance. Optical transmittance tests showed that the sample films possessed excellent optical transmittance of about 90%, and meanwhile, the thermostability of the film was promoted. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of cationic WPUs with octadecyl alkyl side chains - Preparation of cationic WPUs with octadecyl alkyl side chain films - Characterization - RESULTS AND DISCUSSION : Synthesis and characterization of cationic WPUs with octadecyl alkyl side chains - Emulsion property of cationic WPUs with octadecyl alkyl side chains - Properties of CED coatings based on cationic WPUs with octadecyl alkyl side chains - Optical transmittance of CED coatings based on cationic WPUs with octadecyl alkyl side chains - Surface morphology of CED coatings based on cationic WPUs with octadecyl alkyl side chains - Thermal stability of CED coatings based on cationic WPUs with octadecyl alkyl side chains - Water resistance of CED coatings based on cationic WPUs with octadecyl alkyl side chains DOI : https://doi.org/10.1007/s11998-020-00344-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00344-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34571 [article]

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Synthesis and property of room-temperature self-healable cathodic electrophoretic deposition coatings based on cationic waterborne polyurethane / Yingyu Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1621-1633 Titre : Synthesis and property of room-temperature self-healable cathodic electrophoretic deposition coatings based on cationic waterborne polyurethane Type de document : texte imprimé Auteurs : Yingyu Li, Auteur ; Jingwei He, Auteur ; Hongfeng Luo, Auteur ; Xiaoling He, Auteur ; Fang Liu, Auteur Année de publication : 2022 Article en page(s) : p. 1621-1633 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dépôt électrophorétique Polymères -- Synthèse Polymères en émulsion Polyuréthanes Revêtement autoréparant Revêtements -- Propriétés thermiques Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Cathodic electrophoretic deposition (CED) coatings are inevitably scratched following their application in processes such as automotive finishing. Self-healing coatings possess the ability to repair micro-scale damage, thereby extending their service life and reducing maintenance costs. Here, a novel strategy was developed to synthesize room-temperature intrinsic self-healing CED coatings by inserting 2-aminophenyl disulfide (APDS) into the polymer chain of cationic waterborne polyurethane (CWPU). Emulsion films incorporating the disulfide (SCWPU) could self-heal at room temperature via dynamic disulfide bond exchange and hydrogen bonding interactions, and their structures were confirmed by FTIR and Raman spectroscopy. The thermal properties of the SCWPU films were determined by differential scanning calorimetry and thermal gravimetric analysis. The effects of APDS incorporation and hard segment content (HSC) on the self-healing ability, mechanical and emulsion properties of the SCWPU films were systematically investigated. The results showed that the self-healing abilities of SCWPU film were 97.2% at RT over 24 h and 96.5% at 37°C (body temperature) after 4 h. CED coatings (8 μm, 3H pencil hardness) prepared from SCWPU emulsion also displayed self-healing properties at room temperature. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of cationic waterborne polyurethanes with disulfide bond (SCWPU) - Preparation of SCWPU films - Characterization of SCWPU - Self-healing performance - Preparation of films of cathodic electrodeposition (CED) coatings - RESULTS AND DISCUSSION : FTIR and Raman spectra analysis - Thermal properties - Self-healing properties - Properties of the waterborne CED coatings - Table 1 : Composition of Sxa-CWPU samples (mol ratio) - Table 2 : Composition of SCWPU/HSCa samples (mol ratio) - Table 3 : Properties of the CED film coatings and SCWPU emulsions DOI : https://doi.org/10.1007/s11998-022-00634-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00634-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38294 [article]

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