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| - Pure Photoorientation of Azo Dye in Polyurethanes and Quantification of Orientation ofSpectrally Overlapping Isomers
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| - We show that the occurrence of pure photoorientation by photoisomerization of azo dye in polymers isinfluenced by the polymer molecular structure, as well as by the photoisomerization quantum yields and thecis → trans thermal isomerization rate. These findings are rationalized by the study of the photoorientationof azo dye in a series of polyurethane polymers, each with distinct differences in the molecular structure ofthe unit building blocks. It will be shown that the thermally activated chromophore movement in these polymersis dictated by the polymer backbone. We also show how to quantify coupled photoisomerization andphotoorientation of spectrally overlapping isomers in polymers, and we determine the photoisomerizationquantum yields and the photoorientation movement of the chromophores in azo-polyurethanes.
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