Photoinduced chirality in achiral liquid crystalline azobenzene polymers containing different polar side groups

被引：20
作者：
Zheng, Zhi
Su, Zhiqiang
Wang, Lili
Xu, Jie
Zhang, Qijin [1 ]
Yang, Jianjun
机构：
[1] Univ Sci & Technol China, Dept Polymer Sci & Engn, Hefei 230026, Peoples R China
[2] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230026, Peoples R China
[3] Univ Sci & Technol China, Ctr Tech Serv Life Sci, Hefei 230026, Peoples R China
[4] Univ Sci & Technol China, Dept Precis Machinery & Precis Instrumentat, Hefei 230026, Peoples R China
[5] Anqing Teachers Coll, Anqing 246011, Peoples R China
来源：
EUROPEAN POLYMER JOURNAL | 2007年 / 43卷 / 06期
基金：
中国国家自然科学基金;
关键词：
photoinduced chirality; azobenzene chromophore; liquid crystalline polymer; alignment;
D O I：
10.1016/j.eurpolymj.2007.01.055
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Circular dichroism (CD) was induced in the films of two achiral liquid crystalline polymers, poly[(4'-(6-(methacryloyloxy)hexyl)oxy)-(4-X)azobenzene] (PM6X, X = C and N for cyano and nitro, respectively), by irradiation with one handed circularly polarized light (CPL) at 442 nm. The CD and UV spectra of the polymeric films suggest that left-CPL induces a left helical structure and right-CPL reverses the resulting structure into a right helix. For PM6C, the photoinduced CD values of the nematic film are much higher than in the casting and isotropic film. The photoinduced chirality of PM6C films is higher than PM6N due to a higher polarity of nitro groups in PM6N. The PM6N's CD intensity around 450 nm is increased with the irradiation time of linearly polarized light (LPL) followed by left-CPL irradiation. The correlation between azobenzene chromophores and circularly polarized light will be discussed in the paper. (c) 2007 Published by Elsevier Ltd.
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收藏
页码：2738 / 2744
页数：7
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