Photochromic transformations of 6-nitrospiropyran in matrices of linear and branched polymers

Article abstract of DOI:10.1007/s11172-007-0033-0

Photochromic transformations of 6-nitrospiropyran in matrices of linear polystyrene and poly(methyl methacrylate) and branched polymethacrylates of various composition and structure were studied by absorption spectroscopy. In the case of linear polymers the kinetics of bleaching of the colored merocyanine form of 6-nitrospiropyran is determined by polarity and molecular mobility of the polymer matrix. The kinetic regularities of merocyanine transformations into the initial spiropyran in the branched polymer matrices are apparently caused by specific features of their architecture, differences in the degree of branching, and the properties associated with molecular mobility.