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Abstracts-Results of an experimental study of influence of mechanical deformations, radiation cross link ing, and thermal oxidation on the electret effect in polyolefin cable dielectrics are given. It is shown that the polarization of polyolefin electrets in the electric gas discharge can be described in the context of the wave (current) model. That Ohm's law is fulfilled during polarization of centers of capture in polymer cable elec trets is demonstrated.

The problem of investigation of mechanical and electrophysical properties of polymeric materials crosslinked by X-ray radiation from a gaseous electric discharge is considered. The effect of radiation crosslinking on the mechanical strength and hardness of polymers is presented by the example of samples of various thicknesses (from 0.08 mm to 10 mm) of LDPE and HDPE made using crosslinking technology by X-ray radiation from a barrier gaseous electric discharge proposed in [1]. Experimental data obtained on samples of low molecular weight LDPE-107-02K and high molecular weight HDPE-271-82K made in the form of dumbbell, cut in accordance with GOST IEC 60811-2-1 from PE plates, are considered. To study the electrophysical properties and the depth of semi-absorption of X-ray radiation from gaseous electric discharge, LDPE and HDPE samples in the form of disks of different thicknesses were used.The depth of penetration of X-ray radiation from a gaseous discharge into LDPE-107-02K and HDPE-271-82K was estimated.Comparative studies of changes in the electrophysical properties of mechanical strength and hardness of cable LDPE under the influence of X-ray radiation from gaseous discharge and under the influence of an electron beam are carried out.It is shown that the mechanical strength and hardness of LDPE and HDPE can be increased by at least 30% and 60% respectively via radiation crosslinking by X-ray from a gaseous discharge.

Mica is one of the most widespread minerals. Muscovite and phlogopite whose large reserves are located in Irkutsk region have various industrial applications. Due to the crisis, a large amount of mica remained unclaimed. There are mining dumps of raw materials and production waste. The use of mica and the disposal of industrial waste are urgent problems. One of the ways to solve them is to produce mica-based composite materials. The use of such materials will improve technical and economic indicators of production processes and contribute to the development of low-waste and non-waste technologies, protection of the environment. The article aims to establish fundamental laws of production of mica-based composite materials. The article provides recommendations on production technologies. Samples of muscovite, phlogopite mica, mine scraps and mica waste were studied. The methods of physicochemical analysis were used to study the samples. Thermodynamic and quantum chemical calculations were made. Based on the experimental studies and scientific generalizations, the theoretical foundations of the production technology for temperature-resistant mica-based materials and effective heating elements based on mica composite materials were developed. They are based on the integrated and rational use of mineral raw materials.

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