影像科学与光化学 ›› 2013, Vol. 31 ›› Issue (6): 456-462.DOI: 10.7517/j.issn.1674-0475.2013.06.456

• 应用与发展 • 上一篇    下一篇

曝光量对含香豆素基团的液晶共聚高分子的光控取向性能的影响

曹进, 张伟民, 杨姣, 蒲嘉陵   

  1. 北京印刷学院 印刷包装材料与技术北京市重点实验室, 北京 102600
  • 收稿日期:2013-06-13 修回日期:2013-07-18 出版日期:2013-11-15 发布日期:2013-11-15
  • 通讯作者: 蒲嘉陵,E-mail:pujialing@bigc.edu.cn.
  • 作者简介:曹 进(1988-),北京印刷学院材料物理与化学研究生,主要研究方向为信息记录材料;张伟民,北京印刷学院教授.
  • 基金资助:

    北京印刷学院院级重点项目(E-a-2012-24);北京市高校创新团队建设提升计划项目.

The Effect of Exposure Energy on the Photoalignment of Liquid Crystals Using Coumarin-Containing Copolymer Film

CAO Jin, ZHANG Wei-min, YANG Jiao, PU Jia-ling   

  1. Beijing Key Laboratory of Printing & Packaging Materials and Technology, Beijing Institute of Graphic Communication, Beijing 102600, P. R. China
  • Received:2013-06-13 Revised:2013-07-18 Online:2013-11-15 Published:2013-11-15

摘要:

本文设计合成了含有香豆素光敏基团的单体4-(6-丙烯酰氧基己氧基)苯甲酸-7-羟基香豆素酯(M1)和一种只含液晶基元的单体4-(丙烯酰氧基)己基苯甲酸-4-甲氧基苯酚酯(M2),并将这两种单体进行自由基聚合得到了共聚物.当该聚合物薄膜置于线性偏振紫外光(LPUV)下,会发生轴选择性的光化学反应,利用动态紫外光谱(UV光谱),对所合成的共聚物的光化学性能进行了研究.结果表明:当曝光能量为1740 mJ/cm2时,光反应达到饱和,紫外吸光度将不随曝光能量的变化而变化;随着曝光能量的增加,聚合物在反应初期光反应速率比较大,当曝光能量达到500 mJ/cm2左右,光反应度已经超过50%;当曝光量达到324 mJ/cm2,各向异性ΔA达到最大,ΔAmax=0.039.

关键词: 液晶, 光敏基团, 香豆素, 各向异性, 光控取向

Abstract:

In this article, two monomers were synthesized. One is with photosensitive group and another contains nothing but a mesogenic unit. Copolymer was obtained by free radical polymerization. When the copolymer film is exposed to the linearly polarized ultraviolet light (LPUV), it can generate a polarization-axis selective photoreaction. The photoalignment performance of the synthesized copolymer was tested preliminarily using dynamic UV spectrum. The results indicate that when the exposure energy gets to 1740 mJ/cm2, the UV absorption do not change with the increasing of exposure energy. At the early stage, the rate of photoreaction is very fast. When the exposure energy is 500 mJ/cm2, the degree of photoreaction is more than 50%. A large anisotropy ΔAmax=0.039 was generated when the exposure energy gets to 324 mJ/cm2.

Key words: liquid crystal, photosensitive group, coumarin, anisotropy, photoalignment

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