Journal
POLYMER
Volume 50, Issue 9, Pages 2104-2112Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2009.03.007
Keywords
Liquid crystal; Photoalignment; Polystyrene
Categories
Funding
- Research Institute of Engineering & Science (RIES) at Seoul National University, Korea Research Foundation through the Basic Research Program [KRF-2008-314-D00112]
- Soongsil University
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available