PHASE ANALYSIS AND ELECTRICAL PROPERTIES OF COMPOSITES BASED ON HIGH PRESSURE POLYETHYLENE WITH Na+-MONTMORILLONITE FILLER

One of the promising areas in polymer science is the development of methods for obtaining and studying polymer composites and nanocomposites. An important advantage of composites is their higher functionality and electrical stability compared to polymer analogues. The functioning of composite structures as an active element is associated, in particular, with charge formation phenomena. Therefore, in the development of new dielectric composites, researcher's attention mainly focuses on their production and study of dielectric properties under effect of various factors (temperature, frequency). These studies can serve as a basis for selecting components of compositions for obtaining elements with predetermined parameters and assessing the possibility of their use as a dielectric. Analysis of literature data shows that fillers impart increased thermal and electrical conductivity, new magnetic properties to polymer materials, improve mechanical and electrical strength, etc. In the work presented the results of a study of surface microrelief and X-ray phase analysis of high pressure polyethylene with Na+-montmorillonite filler (HPPE+x wt% Na+-MMT) composites, the results of the study on the temperature dependences of dielectric permittivity and the tangent of the dielectric loss angle. It was found that with an increase in the filler content, the degree of crystallinity of the composites decreases, dielectric permittivity increases, and dielectric losses decrease. The results of the X-ray phase analysis of the composites show that with an increase in the filler content of Na+MMT, the degree of crystallinity of the composites decreases from 50.5% (for 10 wt.%) to 62.1% (for 5 wt.%).