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[en] It has been investigated the interrelationship between the changes occurred in IR spectra of initial and gamma irradiated composite samples obtained on the basis of Si nanoparticles with copolymer P(VDF-TrFE) of polyvinylidene fluoride with tetraftoretilen and electrical properties It is shown that, optical properties of P(VDF-TeFE)/nano-Si composites change depending on the amount of filler and irradiation dose and there is a one-valued relationship between this change and electrical properties of composites. Based on the analysis of IR spectra obtained before and after gamma radiation of P (VDFTeFE)/nano-Si composites, we can say that the crystallization rate of the system is increasing as a result of interaction of the active centers formed on the matrix after radiation with the surface of Si nanoparticles on the interphase boundary. The optical properties of P (VDF-TeFE)/nano-Si composites obtained based on the P (VDF-TeFE) polymer change depending on the amount of filler and the radiation dose, and there is a one-valued relationship between this change and the electrical properties of the composites.