Journal
POLYMER
Volume 50, Issue 11, Pages 2349-2356Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2009.03.033
Keywords
Liquid crystalline polymer; Hydrogen bonds; Photoinduced orientation
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Funding
- Japan Society for the Promotion of Science [16105004]
- Grants-in-Aid for Scientific Research [21350129, 16105004] Funding Source: KAKEN
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Photoinduced reorientation of liquid crystalline polymethacrylates comprised of various lengths of alkylene spacers terminated with 4-oxycinnamic acid in the side chain and low-molecular liquid crystal (LC) alignment on the resultant photoreacted films were investigated using linearly polarized UV light. As the length of the spacer increased, the photoinduced optical anisotropy (Delta A) of the thin films increased, and Delta A increased as the irradiating temperature increased. Exposing the polymeric films in the LC temperature range of the material generated an in-plane molecular reorientation because the small photoinduced Delta A was simultaneously amplified. The low-molecular LCs aligned homogeneously on the photoreacted polymeric films, but the LC alignment direction depended on the alkylene spacer length and the degree of the photoreaction. (C) 2009 Elsevier Ltd. All rights reserved.
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