MODELING OF ELECTROPHYSICAL TRANSFORMATIONS IN FIREPROOF COMPOSITIONS OF ETHYLENE-VINYL ACETATE COPOLIMER AND ALUMINUM OXIDE TRIHYDRATES

Abstract

To determine the rational composition of fireproof polymer compositions with improved electrophysical  characteristics,  which  composed  of  an  ethylene-vinyl  acetate  copolymer  and  aluminum trihydroxide  based  on  the  results  of  studies  of  the  dependence  of  electrical  strength,  specific  volume electrical resistance, dielectric loss tangent and physical permittivity of the ingredients and the amount and modifier properties. Ethylene-vinyl acetate copolymer and aluminum trihydroxide polymer compositions which had different content of organosilane as a modifier were manufactured on the compounding line of X-
Compound, Switzerland. To assess the insulating properties of the material used methods for measuring the electrical strength, specific volume electrical resistance, dielectric constant and tangent of dielectric loss. Findings.  The  dependences  of  changes  in  the  electrophysical  properties  of  fireproof  plymer
compositions  depending  on  the  rheological  properties  of  the  polymer  matrix  and  the  physicochemical properties of aluminum oxide trihydrates are revealed. The effect of nano-modifiers based on organosilanes on the properties of the compositions was investigated. The phenomenon of a synergistic effect with the use
of modified mixtures was found. Originality.The  effect  of  modifiers  on  the  electrophysical  properties  of  fireproof  polymer compositions and the synergistic effect of their action is established. It is shown that the addition of 60% of the mass. aluminum oxide trihydrate 2 in a composition based on ethylene-vinyl acetate copolymers with the content of aminosilane 1 in the amount of 1.5% by weight. provides improved electrical insulation properties of the material. Practical  value.  The  practical  features  of  modeling  the  electrophysical  properties  of  fireproof polymer  compositions,  which  consist  in  the choice  of  a  rational  composition  to  achieve  the  specified own.