Аннотация:Formation of paramagnetic species in radiolysis of polytrichlorobutadiene and its interpolymers with polystyrene was studied using ESR spectroscopy. The main products of low-temperature radiolysis of polytrichlorobutadiene are chloroallyl radicals; in the samples that contain measurable amounts of conjugated bonds polyenyl radicals are also formed. The interphase electron transfer plays an important role in the radiolysis of microheterogeneous interpolymers; this results in positive deviations from additivity for the formation of paramagnetic species.