Liquid Crystal Alignment Properties on Polyamide Films Bearing a Phenylenediacryloyl Moiety in the Main Chain

Title
Liquid Crystal Alignment Properties on Polyamide Films Bearing a Phenylenediacryloyl Moiety in the Main Chain
Author(s)
이승우권세진채복남[채복남]김주영정우식
Keywords
PHOTOSENSITIVE POLYESTERS; COMMAND SURFACES; SIDE-GROUPS; POLYIMIDE; POLYMER; PHOTOALIGNMENT; PHOTOREACTION; ORIENTATION; UNITS; ACID
Issue Date
201208
Publisher
TAYLOR & FRANCIS LTD
Citation
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.563, pp.1 - 9
Abstract
Soluble photosensitive polyamide, which has a photoreactive 1,4-phenylenediacryloyl (PDA) moiety in the main chain with biphenyl side groups, was synthesized with high molecular weights. The polymer produced high quality films through conventional spin-casting and dry processing with relatively good thermal stability. The photochemical reactions of the polyamide in the films were investigated by UV-Vis spectroscopy; the polymer in the film demonstrated excellent photoreactivity to UV light. Linearly polarized ultra-violet light (LPUVL) irradiation induced anisotropic reorientations of the polymer chains in the film as a result of direction-selective photoreaction of the PDA moieties. The polyamide thin films were found to have excellent unidirectional orientation ability as a result of photo-exposure with LPUVL; the direction-selective photoreaction of the PDA moiety in the main chains induced alignment of nematic liquid-crystals (LCs) on the surface. The pretilt behaviors of the LC molecules on the LPUVL irradiated film surfaces were controlled by both the exposure dose of LPUVL and the annealing temperature.
URI
http://hdl.handle.net/YU.REPOSITORY/27549http://dx.doi.org/10.1080/15421406.2012.687889
ISSN
1542-1406
Appears in Collections:
공과대학 > 화학공학부 > Articles
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