新型无副产物聚乙烯基电缆绝缘材料结构与性能OA

Current primary cable insulation material is peroxide crosslinked polyethylene(XLPE),but the crosslinking process generates byproducts that adversely affect the dielectric properties of the insulation materials.A new type byproduct-free polyethylene copolymer cable insulation material,which forms crosslinked network via click chemistry reaction,shows promise as a future alternative for XLPE cable insulation.However,the influence of the insulation formulation on the structure and performance of this material requires further investigation.In view of this,the byproduct-free crosslinked polyethylene copolymer(XLCP)cable insulation material was prepared using a blend of ethylene-glycidyl methacrylate copolymer(PE-GMA)and ethylene-acrylic acid copolymer(PE-AA).By adjusting the acrylic acid(AA)monomer content in PE-AA,three insulation blend systems were developed.The structures and dielectric properties of these samples were characterized through infrared spectroscopy,differential scanning calorimetry,broadband dielectric spectroscopy,and direct current(DC)breakdown testing.The results demonstrate that as the AA content in PE-AA increases,the mass ratio of PE-AA in the blend decreases,leading to a reduction in carboxyl group content,an increase in crystallinity and melting temperature.Dielectric properties exhibit limited sensitivity to formulation modifications.DC breakdown tests reveal that samples with higher PE-AA content exhibit higher DC breakdown strength at room temperature but lower breakdown strength at 90 ℃,indicating greater temperature sensitivity in their DC breakdown strength.These findings provide theoretical guidance for optimizing the formulation of next-generation cable insulation materials.