Alignment of Nematic Liquid Crystals on Poled Photo-Polymer Films
作者:
A. Rastegar,
M.W. Kim,
I.Drevenšek Olenik,
P.De Witte,
R. Nolte,
Th. Rasing,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 2000)
卷期:
Volume 351,
issue 1
页码: 169-178
ISSN:1058-725X
年代: 2000
DOI:10.1080/10587250008023266
出版商: Taylor & Francis Group
关键词: Photo induced alignment;PVCN;electrically poled photopolymer;surface anchoring
数据来源: Taylor
摘要:
We have studied the alignment of nematic liquid crystals on Electrically Poled Photopolymer (EPP) films. Polarization microscopy studies show different textures in the planar and Twisted Nematic (TN) cells that were made of an EPP substrate and a rubbed-polyimide (PI) substrate. The EPP films exhibit a small pretilt angle of 3 to 5 degrees depending on the cell configuration. In contrast to the small anisotropy of the EPP film compared to Linearly Photo Polymerized (LPP) films, the azimuthal anchoring strength of the EPP films is larger than that of LPP films and depends on the UV exposure time. The alignment of EPP films in the TN cells is stable for months whereas the alignment of the LPP films is destroyed within three days.
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