| 초록 |
we report the synthesis of a new ionic polymer, poly(4-vinylpyridine-co-styrene) with pendant spiroxazine moieties by the polymer reaction of poly(4-vinylpyridine-costyrene) and bromohexyl derivative of spiroxazine and its photochromic behaviors.The photochromic reaction in question is caused by the reversible heterolytic cleavage of the C(spiro)-O bond under UV irradiation, yielding the colored form that can return to the colorless form by ring closure under visible light irradiation or in dark. The visible range absorption increased gradually by UV irradiation which is ascribed to the generation of the open merocyanine form from the closed spiro form. When the sample of polymer was left in the dark at room temperature after irradiation, the absorbance at 600 nm decreased within 10 sec. |
