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Optical applications of organic photochromic polymer
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absorbance absorption band absorption spectra activated alignment Appl applications aryl azobenzene birefringence bleaching Chem chemical chromophores colour development conformation changes copolymer decrease effect electric field electron eyewear fatigue resistance fulgide 35 fulgides glass Goldburt interaction ion pair Irie irradiation isomerization isomers Kamogawa Krongauz laser lenses liquid crystal polymers Macromolecules Makromol matrix film merocyanine mesogenic mesophase methyl mol/mol molecules monomer nematic NISO NISO photochromic non-linear optical pendant azobenzene groups PhCH2 photochemical photochromic lens photochromic liquid crystal photochromic polymer photochromic response photocyclization photoinduced photoirradiation photoisomerization photostimulated Phys plastic poly(methyl methacrylate polymer films polymer matrix polymeric PPG Industries PVP matrix quantum yield radical cations reaction redox Ringsdorf shown in Figure solution solvent spectrum spiropyran spiroxazines stability Stobbe condensation structure substituents Table Taniguchi thermal toluene Toray Industries trans UV irradiation UV light viologen viscosity visible absorption wavelength Yitzchaik