Abstract

Composites based on a homogeneous mixture of low-density polyethylene (LDPE) with powdered natural zeolite (clinoptilolite and heulandite of Agdag deposits, Azerbaijan) in the form of films 140–200 μm thick and 20 mm in diameter have been obtained by hot pressing at a temperature of 403–413 K and pressure of 15 MPa, followed by quenching in a mixture of ice and water. The dielectric parameters (the real part of the dielectric constant (ε'), the tangent of the dielectric loss angle (tan δ), and the electrical conductivity (σ)) of the composite samples of 60 vol % LDPE/40 vol % zeolite and 40 vol % LDPE/60 vol % zeolite have been examined at frequencies of 25–10⁶ Hz and in a temperature range of 293–403 K. On the basis of the temperature dependence of the electrophysical parameters of composite samples, it has been revealed that tanδ and σ increase with an increase in the filler content and this is associated with an increase in the concentration of charge carriers and their mobility. The study of the frequency dependences ε′ = f(log ν), tan δ = f(log ν), and log σ = f(log ν) has shown the presence of two linear regions of the frequency dependences of electrical conductivity, which change according to the law σ_ac(ν) ∼ ν^0.73, and this is more consistent with the hopping mechanism of electrical conductivity of LDPE/zeolite composites.

中文翻译：

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低密度聚乙烯和沸石复合材料的电物理性质

摘要

基于低密度聚乙烯（LDPE）与粉末状天然沸石（阿格达格沉积物的斜发沸石和赤铁矿，阿塞拜疆的均质混合物）的复合材料，通过在室温下热压成膜，厚度为140-200μm。温度为403–413 K，压力为15 MPa，然后在冰和水的混合物中淬火。60体积％LDPE / 40体积％沸石复合样品的介电参数（介电常数的实部（ε'），介电损耗角正切（tanδ）和电导率（σ））在25–10 ^6的频率下检查了40vol％的LDPE / 60vol％的沸石Hz且在293–403 K的温度范围内。根据复合样品的电物理参数对温度的依赖关系，已发现tanδ和σ随填料含量的增加而增加，并且这与填料含量的增加有关载流子的浓度及其迁移率。对频率依赖性ε'= f（logν），tanδ= f（logν）和logσ= f（logν）的研究表明，存在两个线性的电导率频率依赖性线性区域，依法σ变化_的交流（ν）〜ν ^0.73，并且这是与LDPE /沸石复合材料的导电性的跳频机制更加一致。