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Thermally stable photoaligned p ‐cyanoazobenzene moieties in polymer thin films
Author(s) -
Ichimura Kunihiro,
Kidowaki Masatoshi,
Fujiwara Takenori
Publication year - 1999
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19991370113
Subject(s) - photostationary state , photoisomerization , azobenzene , chromophore , crystallinity , polymer , materials science , dichroism , irradiation , thin film , photochemistry , circular dichroism , azo compound , solid state , polymer chemistry , crystallography , optics , isomerization , chemistry , organic chemistry , nanotechnology , composite material , physics , nuclear physics , catalysis
Poly(4‐cyano‐4î‐methacryloyloxyazobenzene) displayed a slow E ‐to‐ Z photoisomerization rate and a low Z ‐isomer content at a photostationary state in a film. Linearly polarized 436 nm light irradiation resulted in the gradual generation of dichroism due to the reorientation of the azobenzene chromophores. The photodichroism was enhanced markedly by heating the film and not deteriorated even at 240 °C. Discussion was made on the thermally enhanced photodichroism of the polymer with p ‐cyanoazobenzene side chains in respect to its semi‐crystallinity.