近晶A相液晶在聚酰亚胺LB膜上的排列

Alignment of Smectic Liquid Crystal on Polyimide Langmuir-Blodgett Film

合成了聚酰胺酸,研究了它在气液界面上的成膜条件;制备了聚酰胺酸盐的LB膜,通过亚胺化制得了Y型聚酰亚胺LB膜;用红外光谱证实了亚胺化较为完全。用聚酰亚胺LB膜作为排列S_A相液晶的定向膜,制成了液晶盒。通过偏光显微镜证实了未经摩擦的聚酰亚胺LB膜可以排列成近晶相液晶分子。讨论了影响成膜及液晶分子在聚酰亚胺LB膜上排列的因素。

Polyamic acid was synthesized, and the conditions of forming films on gasliquid interface were discussed. The Langmuir-Blodgett(LB) films of polyamic acid salt and polyimide LB (PILB) films by thermal treatment were obtained. The completeness of removal of amine was confirmed by IR spectrum. In addition, a liquid crystal cell was built using PILB films to align S_A phase liquid crystal. Using polarizing microscope, we confirmed that PILB films without rubbed can align smectic liquid crystal with good results. The affecting factors of forming films and alignment of liquid crystal moleculae on PILB films were also discussed.