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Relationship of photochemical and dynamic behavior of an amorphous photochromic polymer containing azobenzene moieties in the side group
Author(s) -
Fritz Andreas,
Schönhals Andreas,
Rutloh Michael,
Stumpe Joachim
Publication year - 2000
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 - 10.1002/1521-3900(200004)154:1<127::aid-masy127>3.0.co;2-3
Subject(s) - photochromism , azobenzene , isomerization , amorphous solid , photochemistry , absorbance , materials science , photoisomerization , side chain , polymer , dielectric , copolymer , polymer chemistry , azo compound , chemistry , crystallography , organic chemistry , catalysis , optoelectronics , chromatography , composite material
An amorphous copolymer with photochromic azobenzene moieties in the side chain is investigated by UV/Vis and real time dielectric spectroscopy. The aim of this study is to monitor both the reversible E/Z isomerization of the dyes and the influence of the photoreaction onto the matrix. The change of the absorbance and of the dielectric function is measured for the E/Z and the Z/E isomerization. To compare the results model functions are fitted to the measured data and the obtained parameters compared for both experiments. So a correlation between the two spectroscopic methods is established. This analysis leads to a model of the molecular mechanism which is based on excess free volume generated by the photoreaction.