Photochromic transformations of 6-nitrospiropyran in matrices of linear and branched polymers |
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| Authors: | S V Kurmaz I S Kochneva E O Perepelitsina G V Korolev V P Grachev S M Aldoshin |
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| Institution: | (1) Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1 prosp. Akad. Semenova, 142432 Chernogolovka, Russian Federation |
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| Abstract: | 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.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 191–198, February, 2007. |
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| Keywords: | 6-nitrospiropyran merocyanine half-life time poly(methyl methacrylate) polystyrene branched polymethacrylates molecular mobility glass transition temperature |
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