PMMA分散螺吡喃薄膜的微结构与光致变色行为

Microstructure and Photochromic Behavior of PMMA-dispersed Spiropyran Films

通过溶液成膜法制备了聚甲基丙烯酸甲酯(PMMA)分散螺吡喃薄膜(SP-PMMA)和邻苯二甲酸二正辛酯(DOP)改性的聚甲基丙烯酸甲酯分散螺吡喃薄膜(SP-PMMA-DOP),系统研究了微结构对薄膜力学性能和光致变色行为的影响.结果表明,SP-PMMA和SP-PMMA-DOP薄膜均具有较好的力学性质,SP的"稀释效应"降低了PMMA的玻璃化转变温度(Tg),DOP的增容效应和增塑效应提高了SP在PMMA中的分散性,使PMMA的Tg进一步降低,薄膜韧性提高.SP-PMMA薄膜具有可逆的光致变色行为,DOP的加入显著提高了薄膜在常温下的光致变色和热褪色速率.

Polymethyl methacrylate-dispersed spiropyran film（ SP-PMMA） and its modified film by dioctyl phthalate（ DOP） were prepared by solution casting,the effects of the microstructure on their mechanical and photochromic properties were discussed. The results show that the SP-PMMA and SP-PMMA-DOP films have good mechanical strength,the ＂dilution effect＂of SP decreases the glass transition temperature （ Tg ） of PMMA. The incorporation of DOP further decreases its Tg,enhances the dispersion of SP in PMMA and in-creases the film toughness due to the compatibilization and plasticization. SP-PMMA and SP-PMMA-DOP films exhibit the reversible photochromic behaviors. The incorporation of DOP increases the coloring and decoloring rates at room temperature.