All-optically controllable polymer liquid crystal composite films containing the azobenzene liquid crystal

被引:98
作者
Lee, HK
Kanazawa, A
Shiono, T
Ikeda, T
Fujisawa, T
Aizawa, M
Lee, B
机构
[1] Tokyo Inst Technol, Resources Utilizat Res Lab, Midori Ku, Yokohama, Kanagawa 226, Japan
[2] Dainippon Ink & Chem Inc, Sakura, Chiba 285, Japan
[3] Pukyung Natl Univ, Dept Polymer Sci & Engn, Nam Ku, Pusan 608739, South Korea
关键词
D O I
10.1021/cm970818s
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Polymer/liquid crystal (LC) composite films possessing an azobenzene LC as a photoresponsive molecule (AzoCFs) were prepared by the thermal polymerization-induced phase separation method. The composite films (AzoCFs) showed a strong light-scattering state after polymerization, and their optical properties were strongly affected by the compositional ratio of the liquid crystals in the composite film. Change in the transmittance between a light-scattering and a transparent state could be induced isothermally by photoirradiation. Upon irradiation at 366 nm, AzoCFs changed from the light-scattering state to the transparent state. This is ascribed to nematic (N)-isotropic (I) phase transition due to trans-cis isomerization of the azobenzene molecules in the LC domains within the polymer matrix. Furthermore, restoration of the initial state could be achieved by visible-light irradiation (>420 nm), resulting from the I-N phase transition induced by cis-trans back-isomerization of the azobenzene guest molecules.
引用
收藏
页码:1402 / 1407
页数:6
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