Электрофизические свойства композитов на основе полиэтилена низкой плотности и цеолитового минерала

Abstract

Dielectric parameters (ε′, tgδ) and electrical conductivity (σ) of samples composites of 60 vol. % LDPE/40 vol. % zeolite, 40 vol. % LDPE/60 vol. % zeolite was measured at frequencies 25 – 106 Hz and a temperature range 293 – 403 K. Composites based on a homogeneous mixture of LDPE with powdered natural zeolite (clinoptiolite and heilandite — Agdag deposit, Azerbaijan) were obtained in the form of film samples 140 – 200 microns and 20 mm in diameter, by hot pressing at a temperature of 403 – 413 K and a pressure of 15 MPa, followed by quenching in a mixture of ice-water. The temperature dependence of the electrophysical parameters of the samples of the composites revealed that the dielectric loss tgδ and electrical conductivity σ increase with increasing filler content, and this is due to an increase in the concentration of charge carriers and their mobility. The study of the frequency dependences ε′ = ƒ(logν), tgδ = ƒ(logν) and logσ = ƒ(logν) showed the presence of two linear regions of the frequency dependences of the electrical conductivity, which vary according to the law σас (ν) ∼ ν0,73, and this is more consistent with the hopping mechanism of the electrical conductivity of LDPE/zeolite composites.