自修复光致变色聚氨酯复合织物的制备与性能

Preparation and properties of self-healing photochromic polyurethane composite fabric

为提高光致变色涂层织物耐用性能,采用光致变色微胶囊(PM)与两性离子聚氨酯(ZPU)制备PM/ZPU薄膜,并热压到棉织物上得到自修复光致变色PM/ZPU复合织物。对PM/ZPU复合织物的结构和形貌进行表征,并详细探讨了PM/ZPU复合织物的光致变色性能、自修复及回收利用能力。结果表明:经紫外光照射后,PM/ZPU复合织物的最大吸收波长由470 nm转移到530 nm,颜色由黄橙色变为红褐色,且具有良好的耐疲劳性能;基于两性离子的动态可逆性,PM/ZPU复合织物划痕可以在80℃下完全修复,断裂的复合织物在60℃下的粘合强度达到1.47 MPa,展现了优异的自修复性能;通过简单的溶解法可将废弃织物上的涂层进行回收并再利用,重新制备PM/ZPU复合织物依然具有良好的光致变色性能。

In order to improve the durability of photochromic coated fabrics,the photochromic microcapsules(PM)and zwitterionic polyurethane(ZPU)were used to prepare PM/ZPU films,which were then hot-pressed onto cotton fabrics to obtain the self-healing PM/ZPU composite fabrics.The structure and morphology of PM/ZPU composite fabric were characterized,and the photochromic properties,self-healing and recycling ability of PM/ZPU composite fabric were discussed in detail.The results show that the maximum absorption wavelength of PM/ZPU composite fabric changes from 470 nm to 530 nm,the color changes from yellow-orange to reddish-brown,and the fabric has good fatigue resistance.Based on the dynamic reversibility of zwitterionic,the scratches of PM/ZPU composite fabric can be completely repaired at 80℃,and the bond strength of the fractured composite fabric reaches 1.47 MPa at 60℃,showing excellent self-healing properties.The coating on the waste fabric can be recycled and reused by a simple dissolution method,and the PM/ZPU composite fabric can still be prepared with good photochromic properties.