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Photoinduced birefringence properties of poly‐Schiff bases containing triphenylamine
Author(s) -
Niu Haijun,
Huang Yudong,
Bai Xuduo,
Li Xin,
Yang Qingxin
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.20997
Subject(s) - photoisomerization , triphenylamine , polymer , birefringence , materials science , photochemistry , irradiation , anisotropy , polymer chemistry , chemistry , optics , isomerization , organic chemistry , physics , nuclear physics , composite material , catalysis
Anisotropy was induced in poly‐Schiff bases containing triphenylamine with linearly polarized light at 488 nm. Both writing and relaxation processes were described with a biexponential function. The alignment process involved two response modes: a fast response mode and a slow one. The fast response mode was associated with angular‐dependent trans–cis photoisomerization, whereas the slow one was attributed to the position adjustment of the rigid main chains used to obtain well‐aligned monodomains. The writing rate increased with an increase in the light intensity at a low intensity of the irradiation light. Structural factors such as main‐chain rigidity seemed to play important roles in the remaining stored information. The two polymers had large photoinduced birefringence values (0.01 and 0.0015, respectively). © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 2274–2279, 2004