Abstract
Polyimide Langmuir-Blodgett (LB) film possessing a photoresponsive pendant unit was prepared by a «precursor method», where a polyamic acid alkylamine salt was used as the precursor for the polyimide. An azobenzene unit was incorporated onto the polymer backbone as a side chain group in order to allow for a trans-cis photoisomerization to take place. The conformation of the azobenzene unit in the LB films was revealed by means of FTIR reflection-absorption (RA) spectroscopy. The specific orientation of the azobenzene unit affected the in-plane anisotropic photoisomerization during exposure to linearly polarized UV light
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