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用5,5′-(六氟异丙基)-二-(2-氨基苯酚)(6FHP)、均苯四甲酸酐(PMDA)及分散红1(DR1)合成了具有光致变色性能的含偶氮苯侧链型聚酰亚胺。利用红外(IR)、紫外-可见(UV-Vis)、示差扫描量热(DSC)和热失重分析(TGA)等手段对该光致变色聚合物材料进行了结构和热性能表征。示差扫描量热分析测得其玻璃化转变温度为298℃,热重分析测得其热分解温度为365℃,表明具有非常好的热稳定性。研究了该材料的N-甲基-2-吡咯烷酮(NMP)溶液和聚合物薄膜在紫外光诱导下的光异构化及热回复异构化行为。结果表明,在一定波长(365 nm)紫外光诱导下均能发生光致变色现象,对于实现偶氮材料的永久光致双折射和永久光存储具有一定意义。
The photochromic properties of the compounds with photochromic properties were synthesized with 5,5 ’- (hexafluoroisopropyl) -bis- (2-aminophenol) (6FHP), pyromellitic dianhydride (PMDA) and Disperse Red 1 (DR1) Azobenzene Side Chain Polyimide. The structure and thermal properties of the photochromic polymer were characterized by IR, UV-Vis, DSC and TGA. The glass transition temperature measured by differential scanning calorimetry was 298 ° C, and the thermal decomposition temperature measured by thermogravimetric analysis was 365 ° C, indicating that it had very good thermal stability. The photo-isomerization and thermal-isomerization of N-methyl-2-pyrrolidone (NMP) solution and polymer films under ultraviolet light were studied. The results show that photochromism can occur under the UV light of a certain wavelength (365 nm), which is of great significance for the permanent photoinduced birefringence and permanent light storage of azo materials.