Conclusion
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1.
The photochromic behavior of the spiropyrans studied in a polystyrene matrix is satisfactorily described by three relaxation times of the polymer. The redistribution of the contribution of the contribution of the relaxation processes on prolonged UV irradiation is connected with the photodecomposition of the spiropyrans.
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2.
The plasticization of a polystyrene matrix increases the rate of photocoloration and of the thermal decoloration of the spiropyrans.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1268–1271, 1982.
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Arsenov, V.D., Cherkashin, M.O. Thermal decoloration of indolinospiropyrans in a plasticized polystyrene matrix. Russ Chem Bull 31, 1129–1132 (1982). https://doi.org/10.1007/BF00955962
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DOI: https://doi.org/10.1007/BF00955962