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Reversible photodimerisation of ω‐anthrylpolystyrenes
Author(s) -
Coursan Magali,
Desvergne Jean Pierre,
Deffieux Alain
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970502
Subject(s) - quantum yield , polystyrene , dispersity , fluorescence , polymer , photochemistry , chemistry , dissociation (chemistry) , molar mass , polymer chemistry , irradiation , ether , yield (engineering) , materials science , organic chemistry , optics , physics , nuclear physics , metallurgy
The preparation of polystyrene with controlled molar masses and narrow dispersity endcapped with an anthrylmethyl ether group, as well as the study of their photophysical properties, are described. Under irradiation at 336 nm dimerisation of the polystyrene chains is observed. This process results from the formation of a symmetrical head‐to‐tail photodimer between two anthryl end groups. When irradiated at lower wavelength (λ = 228 nm), the original ω‐anthrylpolystyrene chains are quantitatively restored. These dimerisation/dissociation cycles can be conducted more than ten times without any detectable degradation of the photosensitive polymer. The fluorescence emission quantum yield and fluorescence lifetime of the ω‐anthryl moieties and the quantum yield of the dimerisation and of the reverse process have been measured.