Электрофизические свойства композитов на основе полиэтилена низкой плотности и цеолитового менерала, модифицированных гамма-излучением

Abstract

Dielectric parameters (ε′, tgδ) and electrical conductivity (σ) of composite samples of LDPE 60 vol. %/Zeolite 40 vol.% and LDPE 40 vol. %/Zeolite 60 vol. % γ-irradiation dose of 50 – 300 kGy in air, was measured in the temperature range 293 – 403 K and at frequencies 25 – 106 Hz. Composites based on a homogeneous mixture of LDPE with powdered natural zeolite (clinoptilolite and heulandite — Agdag deposits, Azerbaijan) were obtained in the form of film samples 140 – 200 μm thick and 20 mm in diameter by hot pressing at a temperature of 403 – 413 K and a pressure of 15 MPa, followed by quenching them in an ice-water mixture. The temperature dependence of the electrophysica parameters of the composite samples made it possible to reveal that the real part of the dielectric constant (ε’), dielectric losses tgδ and electrical conductivity с decrease with an increase in the filler content, and this is associated with an increase in the concentration of charge carriers and their mobility after exposure to γ-irradiation with a dose 50 – 300 kGy. The study of the frequency dependences ε′ = ƒ(lgν), tgδ = ƒ(lgν) and lgσ = ƒ(lgν) of the samples modified by γ-irradiation showed the presence of two linear regions of the frequency dependences of the electrical conductivity, observed as in unirradiated samples, which have lower values ​​and change according to the law σac(ν) ~ ν0.73, and this is more consistent with the hopping mechanism of electrical conductivity of LDPE / zeolite composites.