Abstract
We report on a series of photoresponsive azobenzene poly(ester imide)s thermally converted from their precursor poly(ester amic acid)s. Thermal properties as well as ability for efficient photoinduced chromophore orientation and polymer mass transport under linearly polarized blue irradiation were investigated, focusing on the effect of azo chromophore location within polymer chain. The amount of chromophore alignment studied in the experiment on photoinduced birefringence differed by a factor of l.5 between the materials. Despite the fact that the generated birefringence was of the same order of magnitude, very large differences in efficiency of surface relief grating formation were seen. Specific features of photoresponsive behaviour of the polymers were shown to correlate with the presence or the absence of intrachain CH⋯π interaction between azobenzene hydrogen and aromatic imide structure, which was revealed by density functional theory (DFT) calculations. Advantageous chromophore location next to the imide groups for effective light-driven processes was shown.
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Schedule a callMore From: Journal of Photochemistry and Photobiology A: Chemistry
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