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LC Alignment Mechanism for the Polarized UV‐Exposed Polyimide Films
Author(s) -
Ha K.,
Ahn W.,
West J. L.
Publication year - 1998
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1833864
Subject(s) - polyimide , dichroism , photodegradation , polarization (electrochemistry) , materials science , perpendicular , molecule , photochemistry , ultraviolet , liquid crystal , irradiation , crystallography , optics , optoelectronics , chemistry , nanotechnology , photocatalysis , organic chemistry , physics , catalysis , geometry , mathematics , layer (electronics) , nuclear physics
Abstract We used IR dichroism measurements to investigate the mechanism of liquid crystal (LC) alignment in polyimide (PI) films exposed to polarized ultraviolet (PUV) light. After PUV irradiation, we found preferential photodegradation of the PI molecules which were parallel to the PUV polarization direction. The remaining molecular chains of the PI were perpendicular to the PUV polarization direction.