Direct observation of the kinetic behavior of a charge-transfer reaction on the cation-scavenging reaction for cation radicals of N-vinylcarbazole and N-ethylcarbazole by using a pulse radiolysis technique

The cation-scavenging reaction has been directly observed by using the pulse radiolysis method for cation radicals of both N-vinylcarbazole (VCZ⁺·; the initiating species of radiation-induced cationic polymerization of VCZ) and N-ethylcarbazole (EtCZ⁺·, nonpolymerizing model compound) in order to elucidate the role of inhibitors in radiation-induced cationic polymerization. The rate constants for the reactions of VCZ⁺· with triethylamine, diphenylamine, and dimethylaniline in nitrobenzene solution have been determined to be 1.3 × 10⁹, 2.0 × 10⁹, and 3.9 × 10⁹ M^-1 s^-1, respectively, which are almost the same as those for EtCZ⁺· with these three scavengers.