Factors affecting in-plane and out-of-plane photoorientation of azobenzene side chains attached to liquid crystalline polymers induced by irradiation with linearly polarized light

被引:134
作者
Han, M [1 ]
Morino, S [1 ]
Ichimura, K [1 ]
机构
[1] Tokyo Inst Technol, Chem Resources Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
关键词
D O I
10.1021/ma000347m
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Photoinduced orientational behavior of polymethacrylates with side chains (amorphous polymers, pMAz2 and C2nMeO, and liquid crystalline polymers, C6MeO and C12MeO) with different; alkylene spacer lengths (n = 2, 6, 12) were investigated by means of polarized Fourier transform infrared (FT-IR) and UV-vis absorption spectroscopy. Being different from pMAz2, C2MeO showed high optical anisotropy due to in-plane orientation and the excellent thermostability even above T-g, which can be explained in terms of potential liquid crystallinity to be able to have a tendency to form a well-ordered domain. We observed marked dependence of photoorientation processes on film temperatures of C6MeO. While in-plane orientation was generated in glassy state as well as at 76 degrees, irradiation at 90 degrees C slightly lower than T-SN (transition temperature between smectic and nematic phases) gave rise to the distinct transformation from in-plane orientation at the early stage to successive out-of-plane reorientation, which was accompanied by H-aggregation. This situation enabled ones to record optical images in a C6MeO film on the basis-of the difference in birefringences between two orientational modes. The biaxial reorientation occurred also for C12MeO, though both in-plane and out-of-plane photoorientation occurred simultaneously at room temperature as well as elevated film temperatures.
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页码:6360 / 6371
页数:12
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