Photo-induced phase transition of side chain liquid crystalline copolymers with photochromic group
1995; Elsevier BV; Volume: 31; Issue: 1 Linguagem: Inglês
10.1016/0014-3057(94)00134-0
ISSN1873-1945
AutoresTakanori Hayashi, Hirofumi Kawakami, Yasuo Doke, Akira Tsuchida, Yoshihiko Onogi, Masahide Yamamoto,
Tópico(s)Surfactants and Colloidal Systems
ResumoAbstract Liquid crystalline copolymers containing 4′-cyanobiphenyl-4-oxyundecylacrylate (CBO-11-A) groups and phenylazophenyloxy-undecylacrylate (ABO-11-A) groups with various proportions were synthesized. The copolymers take a highly liquid crystalline state but the temperature range of liquid crystalline state was narrowed with increasing azobenzene content. Isothermal phase transition of copolymers was induced by the photoisomerization of the azobenzene moiety with irradiation of 365 nm light. The response time of this phase transition was measured using an excimer pulse laser (351 nm). It took from a few ms to several hundred ms at 70–80 °C to cause a phase transition in these liquid crystalline systems.
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