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1740mJ/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500mJ/cm2左右,光反应度已经超过50%;当曝光量达到324mJ/cm2,各向异性ΔA达到最大,ΔAmax=0.039.
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 （I.PUV）, 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 ral/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 Amax = 0. 039 was generated when the exposure energy gets to 324 m/cmz.
出处
《影像科学与光化学》
CAS
CSCD
北大核心
2013年第6期456-462,共7页
Imaging Science and Photochemistry
基金
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
关键词
液晶
光敏基团
香豆素
各向异性
光控取向
liquid crystal
photosensitive group
coumarin
anisotropy
photoalignment
