Studies of Li-complexes with acrylonitrile copolymers by the dielectric method

Abstract

Dielectric investigations of films of different composition copolymers based on acrylonitrile (AN) with and without filler-salt LiClO 4 in wide temperature–frequency ranges have been carried out. A single dipole-segmental relaxation process was observed. The region of occurrence of this α-relaxation process is shifted to higher or smaller temperatures depending on the chemical structure of the copolymers. The addition of salt LiClO 4 to the copolymer films results in the decrease of the dielectrical loss factor, sharp limitation of polymer chains mobilities, shift of dipole-segmental relaxation region in the direction of higher temperatures, increase of relaxation times of the dipole-segmental process and also the appearance of two α-relaxation regions for some copolymer systems. It was caused by the formation of coordination bond between the Li + cation and the electron pair on nitrogen atoms in the molecules of AN. The values of effective conductivities for the composites were lower then for copolymers at the temperatures T>Tg. It was caused by the increase of ion–polymer interaction.