Liquid crystal alignment property of polystyrene derivatives containing dual photoreactive side groups
- Authors
- Kang, Hyo; Kang, Daeseung; Lee, Jong-Chan
- Issue Date
- 24-Apr-2009
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Liquid crystal; Photoalignment; Polystyrene
- Citation
- POLYMER, v.50, no.9, pp.2104 - 2112
- Journal Title
- POLYMER
- Volume
- 50
- Number
- 9
- Start Page
- 2104
- End Page
- 2112
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/15848
- DOI
- 10.1016/j.polymer.2009.03.007
- ISSN
- 0032-3861
- Abstract
- We synthesized a series of polystyrene derivatives having the dual photoreactive side moieties, 4-(4-cyanophenylazo)phenoxymethyl and methyl cinnamate-4-oxymethyl, for the application of photoalignment materials. Stable and homogeneous planar LC cells having pretilt angles adjustable from 0.5 degrees to 5 degrees were obtained from these polymer films having molar contents of cinnamate and azobenzene groups in the ranges of 100-80 and 0-20 mol%, respectively, through the irradiation of linearly polarized ultraviolet (LP-UV) light to crosslink the cinnamate groups, followed by the irradiation of linearly polarized visible (LP-Vis) light to induce the isomerization of the azobenzene groups. The electro-optical and LC alignment properties of the LC cells were found to be affected by the molar composition of the photoreactive side groups and the exposure energies of LP-UV and LP-Vis light. (C) 2009 Elsevier Ltd. All rights reserved.
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Collections - College of Engineering > School of Electrical Engineering > 1. Journal Articles
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