Tian Shiyou, Zhang Jicong, Zhou Qiong, Shi Limei, Wang Wenwen, Wang Dong
Key Laboratory of Textile Fiber and Products (Wuhan Textile University), Ministry of Education, Wuhan 430200, China.
Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China.
Polymers (Basel). 2021 Jul 28;13(15):2496. doi: 10.3390/polym13152496.
We report photochromic polyamide 6 (PA6) which was synthesized by hydrolyzed ring-opening polymerization of ε-caprolactam with spiropyran (SP) embedded in the polymer chains. It indicated that crystallinity degree of the resulting copolymers was decreased since only PA6 segments can crystallize with increasing content of SP modifier. Meanwhile, toughness of photochromic PA6 was decreased. The photochromic property analysis indicated that the sample with more flexibility and more content of SP was more sensitive to UV light at the beginning of irradiation than other samples and its color after being irradiated for 1 min tended to reddish. Investigation revealed that the UV-vis absorbance of SP-PA6-3 had negligible decay after 10 cycles, which indicated SP-modified PA6 possessed excellent photoresponse reversibility and fatigue resistance.
我们报道了通过ε-己内酰胺的水解开环聚合反应合成的光致变色聚酰胺6（PA6），其中螺吡喃（SP）嵌入聚合物链中。结果表明，由于只有PA6链段能够结晶，随着SP改性剂含量的增加，所得共聚物的结晶度降低。同时，光致变色PA6的韧性降低。光致变色性能分析表明，在辐照开始时，柔韧性更高且SP含量更高的样品比其他样品对紫外光更敏感，并且在辐照1分钟后的颜色趋于偏红。研究表明，SP-PA6-3在10次循环后紫外可见吸光度的衰减可忽略不计，这表明SP改性的PA6具有优异的光响应可逆性和抗疲劳性。
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