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.
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