Infrared spectroscopic studies of the thermal stability of alignment layers of polarized UV-exposed polyimide films for liquid crystal alignment

被引：2
|
作者：
Ha, K [1 ]
West, JL
机构：
[1] Keimyung Univ, Dept Chem Engn, Taegu 704701, South Korea
[2] Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA
来源：
MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2000年 / 339卷
基金：
美国国家科学基金会;
关键词：
polyimide; infrared spectroscopy; thermal stability; polarized UV;
D O I：
10.1080/10587250008031037
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Polarized Fourier transform infrared (FTIR) and optical microscopy with crossed polarizer were used to investigate the thermal stability of the alignment layers formed by rubbing and polarized UV (PUV) irradiation on the polyimide (PI) films. The thermal stability of the PUV irradiated PI alignment layer is lower than that of the rubbed PI layer due to the fragmentation reaction of me PI by PUV. We also investigated the alignment of the liquid crystal by rubbing or PUV irradiation. Liquid crystal (LC) molecules align parallel to the predominant orientation of the PI and perpendicular to the PUV irradiation direction.
引用
收藏
页码：125 / 137
页数：13
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