Laser-induced temperature distribution in photo-alignment of azobenzene liquid crystalline side chain polymers

被引：0
|
作者：
Wang, X. [1 ]
Shen, W. [1 ]
Zhang, Q. [1 ]
Li, T. [1 ]
Cheng, X. [1 ]
机构：
[1] Dept. of Polymer Science and Eng., Univ. of Sci. and Technol. of China, Hefei, Anhui 230026, China
来源：
Molecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals | 2000年 / 350卷
基金：
中国国家自然科学基金;
关键词：
Glass transition - Laser beam effects - Light polarization - Mathematical models - Molecular orientation - Numerical analysis - Plastic films - Temperature distribution - Thermal effects;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A theoretical model has been worked out to describe a temperature field, which is established within a film of isotropic trans azobenzene liquid crystalline side chain (LCSC) polymers when a linearly polarized laser beam illuminates it, and contributes to the photo-induced alignment behavior of LCSC polymers at an ambient temperature below the glassy transition temperature (Tg). The distribution of the temperature field is analyzed and the mechanism that the mesogens align perpendicular to the electric vector of the light is discussed with this model. The minimum light intensity Ioff required to achieve the photo-induced phase transition of LCSC polymers at a certain temperature below Tg is calculated. A prediction of existence of an offset photo-alignment temperature Toff is made based on this theory model, while below this temperature no photo-induced phase transition can be observed when a light of certain intensity illuminates the sample.
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页码：225 / 235
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