Abstract
A soluble photoreactive polyimide (PSPI) bearing the coumarin (COU) chromophore in the side group, 6F-HAB-COU PSPI, was successfully synthesized with a high molecular weight. Good quality films of this PSPI were obtained using a conventional solution spin-casting and drying process. 6F-HAB-COU PSPI was determined to be positively birefringent and thermally stable up to 300 °C. The photochemical reactions and molecular reorientations of the PSPI in films were investigated in detail using ultraviolet−visible and infrared spectroscopy, dissolution testing, and optical retardation measurements. The COU chromophores of the PSPI were found to undergo only photodimerization. Irradiation of the PSPI films with linearly polarized ultraviolet light (LPUVL) induced anisotropic reorientations of the polymer main chains and anisotropic alignments of the unreacted COU chromophores. Moreover, the LPUVL-irradiated films homogeneously aligned nematic liquid crystal (LC) molecules at an angle of 100° with respect to the po...
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