A comprehensive analysis of vinyl-based matrix resins used in semi-conductive shielding materials for power cables

The type of matrix resin determines the service performance of the semi-conductive shielding materials (SCSMs) and serves as the most critical component for achieving the functionality of the semi-conductive shielding layer in power cables. This work selects the typical matrix resins commonly used in SCSM of power cables, namely ethylene–vinyl acetate (EVA), ethylene-butyl acrylate (EBA), and ethylene-ethyl acrylate (EEA), emphatically analyzes the microstructure and performance characteristics of the matrix resins, and systematically explores the impact of matrix resin on the comprehensive performance of SCSM. The research findings indicate that, compared to EVA, both EBA and EEA exhibit higher molecular weights and crystallinity, as well as enhanced melting points and superior thermal stability. The EBA-based SCSM demonstrates optimal volume resistivity and surface smoothness. Comprehensive analysis suggests that EBA is the ideal matrix resin for SCSM in power cables. This research is expected to provide a theoretical basis for the selection of raw materials for SCSMs and the development of power cables.