Optical properties of chiral nematic side-chain copolymers bearing cholesteryl and azobenzene building blocks
作者:Jui-Hsiang Liu、Yen-Ling Chou、Rathinam Balamurugan、Kai-Hsin Tien、Wen-Tung Chuang、Ming-Zu Wu
DOI:10.1002/pola.24490
日期:2011.2.1
calorimetry and hot‐stage polarizing microscopy showed that all the CPs exhibited a cholesteric nematic phase (N*), and increasing the content of the cholesteryl units in the CPs displayed only the N* phase over a much wider temperature range. On cooling from the isotropic melt of N* CPs, selective reflections of visible light that changed from short to long wavelengths were observed. The photolysis of CPs
合成了带有胆固醇和偶氮苯单元的热致性手性向列(N *)侧链共聚物(CP),以研究自由基聚合衍生的聚合物的手性,非手性和光致变色单体的丙烯酸酯的结构与性质之间的关系。氯取代对手性单体(M3 *)苯环的极性影响仅在单体水平上扩大了中间相转变温度,但未观察到对相应CP的介晶,光学或热致变色的显着影响。对使用差示扫描量热法和热台偏振显微镜制备的CP进行的检查显示,所有CP均显示出胆甾型向列相(N *),并增加CP中胆固醇单元的含量,在更宽的温度范围内仅显示N *相。在N * CPs的各向同性熔体冷却后,观察到从短波长到长波长变化的可见光的选择性反射。CP的光解表明CP1 - CP4经历可逆的光异构化,CP5和CP6经历不可逆的光异构化。异构化速率取决于类型( NN , CHCH ,和两者),并在CP的光致变色单元的内容。©2010 Wiley Periodicals,Inc. J Polym