Tian Yi, Liu Yibin, Su Zhengzhou, Wang Shenqiang, Zhang Baoliang, Zhang Hepeng, Zhang Qiuyu
Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an 710072, P.R. China.
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Northwestern Polytechnical University, Shenzhen 518057, P.R. China.
ACS Appl Mater Interfaces. 2020 Dec 2;12(48):54041-54052. doi: 10.1021/acsami.0c14042. Epub 2020 Nov 17.
In this work, a facile strategy was proposed to prepare a series of brushlike thermoplastic polyurethane (TPU) coatings with mechanically robust, self-cleaning, and icephobic performance. Through a simple multicomponent click reaction of thiolactone with a diamine compound and mono-ethenyl-terminated polydimethylsiloxane (mono-ethenyl-PDMS), a diol with amide groups and flexible PDMS was synthesized, and a novel TPU could be obtained productively by a reaction of isocyanate and diol. The unique chain structure endowed TPU films with ascendant self-stratifying properties. During solvent vapor annealing, flexible PDMS chains migrated and enriched to the surface while urethane linkages with a strong interaction tended to locate at the substrate. Based on this, TPU-PDMS films exhibited mechanically robust property, and the tensile strength value of TPU-PDMS-3 showed a sharp increase to 48.62 MPa. The resultant TPU-PDMS-10 coatings exhibited a water repellent behavior and possessed superior movability of droplet water, and also the dirt on it could be readily removed by rinsing with water without leaving any traces. Furthermore, three different criteria were used to characterize the icephobic performance. The coatings exhibited a significantly lower freezing point (approximately -27 °C) of supercooled water, longer delay-icing time, and less ice adhesion shear strength. Therefore, these novel brushlike TPU coatings have tremendous potential applications.
在这项工作中，提出了一种简便的策略来制备一系列具有机械强度高、自清洁和疏冰性能的刷状热塑性聚氨酯（TPU）涂层。通过硫内酯与二胺化合物和单乙烯基封端的聚二甲基硅氧烷（单乙烯基-PDMS）的简单多组分点击反应，合成了一种带有酰胺基团和柔性PDMS的二醇，并且通过异氰酸酯与二醇的反应可以高效地获得一种新型TPU。独特的链结构赋予了TPU薄膜优异的自分层性能。在溶剂蒸汽退火过程中，柔性PDMS链迁移并富集到表面，而具有强相互作用的聚氨酯键则倾向于位于基底处。基于此，TPU-PDMS薄膜表现出机械强度高的性能，TPU-PDMS-3的拉伸强度值急剧增加至48.62MPa。所得的TPU-PDMS-10涂层表现出疏水行为，具有优异的水滴移动性，并且其表面的污垢可以通过用水冲洗轻易去除而不留下任何痕迹。此外，使用了三种不同的标准来表征疏冰性能。涂层表现出显著更低的过冷水冰点（约-27°C）、更长的延迟结冰时间和更小的冰粘附剪切强度。因此，这些新型刷状TPU涂层具有巨大的潜在应用价值。
