Pretilt angle generation on photoreactive polymer films

被引:18
作者
Galabova, HG [1 ]
Allender, DW
Chen, J
机构
[1] Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA
[2] Kent State Univ, Dept Phys, Kent, OH 44242 USA
来源
PHYSICAL REVIEW E | 1998年 / 58卷 / 03期
关键词
D O I
10.1103/PhysRevE.58.3295
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The mechanism of liquid crystal pretilt angle generation on photoreactive polymer films doubly exposed to linearly polarized ultraviolet (uv) light has been investigated. The first exposure for time; tau(1) is normal to the surface, and the film is subsequently irradiated for time tau(2) With obliquely incident uv light with a plane of polarization rotated by 90 degrees with respect to that of the first uv light. The state of the polymer film after two exposures was characterized with a tensor order parameter, which then served as a boundary condition for the surface state of the nematic liquid crystal. The bulk liquid crystal behavior was investigated using Landau-de Gennes theory extended to include the possibility for weak surface interactions linear in the tensor order parameter. The pretilt angle was calculated as a function of both tau(1) and tau(2), and as a function of the second uv light angle of incidence. The calculated behavior of the pretilt angle was found to be in qualitative agreement with experimental observations. Conclusions about the strength of the anchoring have also been made.
引用
收藏
页码:3295 / 3301
页数:7
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