Dynamic Thermomechanical Analysis on Water Tree Resistance of Crosslinked Polyethylene

摘要: The water tree resistance of crosslinked polyethylene (XLPE) initiated by ultraviolet (UV) irradiation technique is investigated through a blade electrode method, and the effects mechanism UV crosslinking on inhibiting growth are revealed with dynamic thermomechanical analysis (DMA). accelerated aging experiment shows that inhibits rate trees, length width reduced increase degree XLPE. DMA result demonstrates molecular activity amorphous phase in XLPE as represented β-relaxation gradually intensified reaction. Combined fatigue semi-crystalline polymers, it suggested reaction can significantly improve anti-water-tree performance linear low-density (LLDPE). bond UV-photoinitiated produce large number cross-connected polymer chains, which fiber obviously increased, leading to an force from micro-water beads onto crack tip thus decreasing material being destroyed beads.