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- W2057432857 abstract "A comparative study of spectral and photochemical properties and of kinetic characteristics has been carried out for films of crosslinked polymers based on oligocarbonate methacrylates containing indolinospiropyrans combined in the macromolecule. The latter were prepared by polymerizing oligomers containing reactive end-groups in the presence of an indolinospiropyran containing no polymerizable groups (the matrix mixtures). In contradistinction to the matrix mixtures, the decolourization kinetics of the photochromic copolymers in the dark do not obey the equation of a first order reaction. This behaviour is related to the presence of nonequivalent positions in the networks which, in view of the microheterogeneity of the network structure-differ in respect to steric hindrances affecting thermal closure of the pyranic ring. Low activation energies for activation of the dark reaction of decolourization of indolinospiropyrans in the copolymer films prove that the thermal processes depend on relaxation behaviour of the crosslinked polymer. It is shown that the photocolouration efficiency of crosslinked photochromic copolymer films does not differ from that of the matrix mixtures." @default.
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- W2057432857 date "1979-01-01" @default.
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- W2057432857 title "Photochromic transitions occurring in indolinospiropyrans in films of crosslinked polymers based on oligocarbonate methacrylates" @default.
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- W2057432857 doi "https://doi.org/10.1016/0032-3950(79)90294-6" @default.
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