摘要
本文系统地研究了向列液晶分子在各种表面上的排列,特别是研究了在各种聚酰亚胺取向膜表面上的排列状态,并得到6°以上的稳定排列的高预倾角.详细地讨论了沟纹理论和分子相互作用理论,并通过锚定能加以综合分析,提出了两种理论的适用范围.对于有机聚合物表面,我们分析了取向膜的光学各向导性,并分析了占优势的分子相互作用类型.最后,给出了液晶分子的倾斜排列模型,这对实践上对预倾角的控制是相当重要的.
The alignment of liquid crystal molecules on a treated substrate is a necessary and inevitable process for preparing experimental samples or practical display devices, and the machenism of liquid crystal alignment on the different surfaces is one of the research focus in the modern physics of liquid crystals. By measuring the pretilt angle used crystal rotation method, the alignment of liquid crystals on the different surfaces was studied. The groove theory and molecular interaction theory for liquid crystal alignment were discussed and the optical properties of the orientation films were studied. We conclude that the surface grooves play an important role for the liquid crystal alignment on the surface of isotropic inorganic. Rubbing reorientates the main chains or side-branches of PI and induces the optical retardation for the orientation films. The molecular interaction between liquid crystals and polymer materials is the main reason for the liquid crystal surface alignment on the surface of PI films. According to research works, it may be claimed that the surface pretilt angle can be generated by forming the microscopic and asymmetric triangle structure formed on a substrate, where the size of these triangles are comparable to that of liquid crystal molecular length, and the steric interaction among liquid crystal molecules.
出处
《液晶通讯》
CAS
1995年第2期82-109,共28页
