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首页> 外文期刊>RSC Advances >Tailor-made zwitterionic polyurethane coatings: microstructure, mechanical property and their antimicrobial performance
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Tailor-made zwitterionic polyurethane coatings: microstructure, mechanical property and their antimicrobial performance

机译：量身定制的两性离子聚氨酯涂料：微观结构，力学性能及其抗菌性能

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Antimicrobial coating is of great important in leather finishing. Herein, we report a newly synthesized polyurethane with zwitterionic sulfobetaine side groups and evaluate their performance in the antifouling leather coatings. The microstructure of the synthesized zwitterionic polyurethane (iNPU) films has been examined by Fourier transform infrared (FTIR), X-ray diffraction (XRD) and atomic force microscopy (AFM) in order to understand how it influences the mechanical and surface properties. Our results show that introduction of zwitterionic groups into polyurethane can markedly increase the degree of micro-phase separation between the hard and soft segments of the PU chains since the incorporated zwitterionic group leads to more hydrogen bonding and polar interactions, making the hard components to be more thermodynamically incompatible with the soft segments. As the content of the incorporated zwitterionic content increases, the ordered structure in PU chains is reduced, and the micro-phase separation degree is increased. Therefore, the tensile strength and elongation at break of the iNPU films are significantly improved. Dynamic mechanical thermal analysis (DMTA) results further indicate that the Tg of the iNPU coatings decreases, and the deformability greatly increases at a higher content of zwitterionic group. Water contact angle (WCA) measurements reveal the improved surface wetting property due to the presence of zwitterionic group. The antibacterial testing shows that the iNPU coated leather surfaces exhibit reasonably good anti-mold adhesion performance, although the iNPU films do not show apparent contact-killing antibacterial property against E. coli and S. aureus. The present zwitterionic polyurethane is thus can be potentially used as antimicrobial adhesive leather coating materials.
机译：抗菌涂层在皮革涂饰中非常重要。本文中，我们报告了一种新合成的具有两性离子磺基甜菜碱侧基的聚氨酯，并评估了它们在防污皮革涂料中的性能。合成的两性离子聚氨酯（iNPU）膜的微观结构已通过傅立叶变换红外（FTIR），X射线衍射（XRD）和原子力显微镜（AFM）进行了研究，以了解其如何影响机械性能和表面性能。我们的结果表明，将两性离子基团引入聚氨酯可以显着提高PU链的硬链段和软链段之间的微相分离程度，因为引入的两性离子基团会导致更多的氢键和极性相互作用，从而使硬质组分成为在热力学上与软链段不兼容。随着结合的两性离子含量的含量增加，PU链中的有序结构减少，并且微相分离度增加。因此，iNPU膜的拉伸强度和断裂伸长率显着提高。动态力学热分析（DMTA）结果进一步表明，iNPU涂层的 T g 降低，并且在较高含量下变形性大大提高两性离子基团。水接触角（WCA）测量显示由于两性离子基团的存在，改善了表面润湿性。抗菌测试表明，尽管iNPU膜没有表现出明显的抗 E接触杀伤性抗菌性能，但iNPU涂层皮革表面具有相当好的抗霉菌粘附性能。大肠菌和 S。金黄色。因此，本发明的两性离子聚氨酯可潜在地用作抗菌粘合剂皮革涂料。

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