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Proceedings Paper

Surface vibrational spectroscopic studies of rubbed polyvinyl cinnamate for liquid crystal alignment
Author(s): P. Pagliusi; C. Y. Chen; Y. R. Shen
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Paper Abstract

The critical role of buffing strength of poly(vinyl cinnamate) (PVCi) surface for liquid crystal (LC) alignment is reported. It has been found that weakly and strongly rubbed PVCi films provide LC alignment which is perpendicular and parallel to the rubbing direction, respectively. Surface-specific sum-frequency vibrational spectroscopy have been used to investigate the structure of poly(vinyl cinnamate) (PVCi) surface on a molecular level. Quantitative analysis provides an approximate orientation distribution function (ODF) for the aligned cinnamate moieties and the polymer backbones. Weak rubbing aligns the phenyl ring of the cinnamate side-chains perpendicular to the rubbing direction, with the main axis along the surface normal. Strong rubbing orients the phenyl rings toward the plane normal to the surface along the rubbing direction.

Paper Details

Date Published: 15 September 2006
PDF: 10 pages
Proc. SPIE 6332, Liquid Crystals X, 63320X (15 September 2006);
Show Author Affiliations
P. Pagliusi, Lab. Regionale LiCryL INFM-CNR (Italy)
Univ. of Calabria (Italy)
C. Y. Chen, Univ. of California, Berkeley (United States)
Y. R. Shen, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 6332:
Liquid Crystals X
Iam-Choon Khoo, Editor(s)

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