Synthesis and Characterization of Segmented Liquid Crystalline Polymers with the Azo Group in the Main Chain
作者:Domenico Acierno、Eugenio Amendola、Valeria Bugatti、Simona Concilio、Loris Giorgini、Pio Iannelli、Stefano P. Piotto
DOI:10.1021/ma049319k
日期:2004.8.1
segmented polymers. The nematic phase is the result of the effect of the side allyl group which, while it destabilizes the crystalline phase, does not affect the occurring of the nematic order. In the crystalline state, a large hexagonal unit cell containing five to six chains is observed for polymers with longer flexible spacer in the chain. Chloroform solutions and thin films of polymers absorb in
据报道,合成了4'-羟基苯基(4-羟基-3-烯丙基)偶氮苯。该分子是介晶分子,可用于制备向列主链分段聚合物。向列相是烯丙基侧基作用的结果,尽管它使结晶相不稳定,但不影响向列序的发生。在结晶状态下,对于在链中具有更长的柔性间隔基的聚合物,观察到了包含五至六条链的大型六边形晶胞。氯仿溶液和聚合物薄膜在大约332和439 nm的UV可见光范围内吸收,分别对应于偶氮芳族发色团的π→π*和n→π*电子跃迁。在适当的紫外线照射下,我们获得了反式-顺式和顺式的光异构化-反式,在解决方案中是完全可逆的。在固态下达到光平稳状态。