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Decay Kinetics of Benzophenone Triplets and Corresponding Free Radicals in Soft and Rigid Polymers Studied by Laser Flash Photolysis
Author(s) -
Levin Peter P.,
Efremkin Alexei F.,
Sultimova Natalie B.,
Kasparov Valery V.,
Khudyakov Igor V.
Publication year - 2013
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12170
Subject(s) - flash photolysis , kinetics , ketyl , benzophenone , polymer , polystyrene , radical , chemistry , photochemistry , exponential decay , materials science , polymer chemistry , reaction rate constant , organic chemistry , physics , quantum mechanics , nuclear physics
The kinetics of transients formed under photoexcitation of benzophenone (B) dissolved in three different polymers was studied by ns laser flash photolysis. These polymers were the soft rubbers poly (ethylene‐ co ‐butylene) (EB), polystyrene block ‐poly(ethylene‐ ran ‐butylene)‐ block ‐polystyrene (SEBS) and hard polystyrene (PS). We monitored the decay kinetics of triplet state 3 B * and of ketyl radicals BH ● . We observed exponential decay of 3 B * and two‐stage decay kinetics of BH ● in EB. The first stage is a fast cage recombination of a radical pair (BH ● , radical of polymer R ● ). The second slow stage of BH ● decay follows the second‐order law with a relatively high rate constant, which corresponds to recombination of BH ● in a homogeneous liquid with a viscosity of only ~0.1 P (about five times of 2‐propanol viscosity). Application of a magnetic field (MF) of 0.2 T leads to deceleration of both stages of BH ● decay in EB by approximately 20%. Decay kinetics of both transients were observed in SEBS. There was no MF effect on BH ● decay in SEBS. We only observed 3 B * in PS. Decay kinetics of 3 B * in this case were described as polychromatic dispersive first‐order kinetics. We discuss the effects of polymer structure on transient kinetics and the MF effect.