Decay Kinetics of Benzophenone Triplets and Corresponding Free Radicals in Soft and Rigid Polymers Studied by Laser Flash Photolysis

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 3B*and of ketyl radicals BH●. We observed exponential decay of 3B* 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 3B* in PS. Decay kinetics of 3B* 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. The kinetics of transients formed under photoexcitation of benzophenone (B) dissolved in two soft rubbery polymers and hard polystyrene was studied by ns laser flash photolysis. We observed exponential decay of 3B* and two‐stage decay kinetics of BH●in poly(ethylene‐co‐butylene) (EB). The first stage is a fast cage recombination of a radical pair (BH●, radical of polymer R●). Application of a magnetic field (MF) of 0.2 T leads to deceleration of both stages of BH● decay in EB by approximately 20%. We discuss the effects of polymer structure on transients kinetics and the MF effect.