ESR study of stable N,N,N ',N '-tetramethyl-4,4 '-diaminodiphenylmethane radicals in solid solutions

The ESR spectra of gamma -irradiated N,N,N',N'-tetramethyl-4,4'-diaminodiph enylmethane (Am) in solid solutions of poly(vinyl chloride), poly(methyl me thacrylate), and benzene were studied. The formation mechanism of the free radical Am-. in these solutions was discussed. Along with Am-., the formati on of radicals with the cyclohexadienyl structure was shown to be possible in Am irradiation. The influence of the matrix structure on the radiation-c hemical yield of Am-. radicals and their thermal stability was established. The radiation-induced chemical transformations of free radicals and transi ent ionic species resulting in the formation of terminal alkyl radicals in poly(methyl methacrylate) were investigated. Data on the mechanism of the p rotective action of the Am additive during PMMA radiolysis were obtained.