Macromolecular Rapid Communications, Vol.24, No.2, 197-201, 2003
Addition-fragmentation chain transfer involving dimers of alpha-methylvinyl monomers studied by ESR spectroscopy: Competition between fragmentation and bimolecular termination
Detection of the adduct radical by ESR spectroscopy and after-effect ESR measurements of the adduct radical concentrations in the photosensitized polymerization of styrene (St) in the presence of dimers of alpha-methylstyrene (MSD) and methyl methacrylate have revealed that the dominant mechanism of adduct radical loss changes from bimolecular termination to fragmentation as the temperature is increased beyond 90degreesC for St/MSD.
Keywords:activation energy;after-effect;alpha-methylstyrene dimer;radical polymerization;termination rate coefficient