ESR study of nitrogen-containing radicals formed during photolysis and radiolysis of solid polymethylmethacrylate and cellulose triacetate in nitric oxide medium

Photolysis and radiolysis (gamma radiation, absorbed dose 102 J/g) of solid polymethyl methacrylate and cellulose triacetate in the nitrogen oxide medium at room temperature is shown to result in formation of three types of stable macromolecular nitrogen-containing radicals: acylalkylnitroxyl, dialkylnitroxyl and iminoxyl ones. Their ESR spectra are analysed and the possible ways of their formation are discussed. The relation of the nature of formed radicals with molecular dynamics of a polymer is mentioned