Detailed investigation on factors governing liquid crystal alignment on rubbed polystyrene films

被引：13

作者：

Hahm, Suk Gyu

Lee, Taek Joon

Lee, Seung Woo

Yoon, Jinhwan

Ree, Moonhor ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Dept Chem, BK Sch Mol Sci, Pohang 790784, South Korea

[2] Pohang Univ Sci & Technol, Polymer Res Inst, Pohang 790784, South Korea

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2006年 / 132卷 / 1-2期

关键词：

alignment layer; rubbing; orientation; anisotropic interaction;

D O I：

10.1016/j.mseb.2006.02.036

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The molecular orientations and surface morphologies of rubbed films formed from atactic polystyrene (PS) samples with various molecular weights were investigated in detail. Previously unknown surface topography features were newly discovered in rubbed films, depending on molecular weights: submicroscale groove-like meandering structures composed of fine-grooves like pebbles in 10 nm are present, oriented perpendicular to the rubbing direction. The vinyl main chains, however, were preferentially oriented along the rubbing direction and the planes of the phenyl side groups were preferentially oriented perpendicular to the rubbing direction with para-directions that were positioned nearly normal to the film plane. Nematic liquid crystal (LC) molecules were found to always align on the rubbed PS surfaces along the orientation direction of the submicroscale grooves generated by rubbing. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：54 / 58

页数：5

共 36 条

[1] Sequence of the rubbing-induced reorientations of polymer chain segments in nanofilms of a well-defined brush polyimide with a fully rodlike backbone as determined by polarized FTIR spectroscopy and two-dimensional correlation analysis [J].