Water-Tree Resistant Characteristics of Crosslinker-Modified-SiO₂/XLPE Nanocomposites

• Main Authors: Yong-Qi Zhang, Xuan Wang, Ping-Lan Yu, Wei-Feng Sun
• Format: Article
• Language: English
• Published: MDPI AG 2021-03-01
• Series: Materials
• Subjects: crosslinked polyethylene; auxiliary crosslinker; nanodielectrics; water tree growth; dynamic thermo-mechanical analysis
• Online Access: https://www.mdpi.com/1996-1944/14/6/1398

Trimethylolpropane triacrylate (TMPTA) as a photoactive crosslinker is grafted onto hydrophobic nanosilica surface through click chemical reactions of mercapto double bonds to prepare the functionalized nanoparticles (TMPTA-s-SiO₂), which are used to develop TMPTA-s-SiO₂/XLPE nanocomposites with improvements in mechanical strength and electrical resistance. The expedited aging experiments of water-tree growth are performed with a water-knife electrode and analyzed in consistence with the mechanical performances evaluated by means of dynamic thermo-mechanical analysis (DMA) and tensile stress–strain characteristics. Due to the dense cross-linking network of polyethylene molecular chains formed on the TMPTA-modified surfaces of SiO₂ nanofillers, TMPTA-s-SiO₂ nanofillers are chemically introduced into XLPE matrix to acquire higher crosslinking degree and connection strength in the amorphous regions between polyethylene lamellae, accounting for the higher water-tree resistance and ameliorated mechanical performances, compared with pure XLPE and neat-SiO₂/XLPE nanocomposite. Hydrophilic TMPTA molecules grafted on the nano-SiO₂ surface can inhibit the condensation of water molecules into water micro-beads at insulation defects, thus attenuating the damage of water micro-beads to polyethylene configurations under alternating electric fields and thus restricting water-tree growth in amorphous regions. The intensified interfaces between TMPTA-s-SiO₂ nanofillers and XLPE matrix limit the segment motions of polyethylene molecular chains and resist the diffusion of water molecules in XLPE amorphous regions, which further contributes to the excellent water-tree resistance of TMPTA-s-SiO₂/XLPE nanocomposites.