Water-Tree Resistability of UV-XLPE from Hydrophilicity of Auxiliary Crosslinkers
| Autor: | Xuan Wang, Hong Zhao, Wei-Feng Sun, Jun-Qi Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Ultraviolet Rays Mixing (process engineering) Pharmaceutical Science 02 engineering and technology 01 natural sciences Viscoelasticity Article Analytical Chemistry Trees lcsh:QD241-441 chemistry.chemical_compound lcsh:Organic chemistry 0103 physical sciences Drug Discovery Molecule Physical and Theoretical Chemistry auxiliary crosslinker 010302 applied physics photon-initiated crosslinking reaction Molecular Structure Organic Chemistry Water Polyethylene Models Theoretical 021001 nanoscience & nanotechnology Amorphous solid mechanical property Cross-Linking Reagents Chemical engineering chemistry Chemistry (miscellaneous) Electrode Molecular Medicine Molecular Density 0210 nano-technology water tree Hydrophobic and Hydrophilic Interactions Monte Carlo Method Algorithms Monte Carlo molecular modeling |
| Zdroj: | Molecules, Vol 25, Iss 4147, p 4147 (2020) Molecules Volume 25 Issue 18 |
| ISSN: | 1420-3049 |
| Popis: | The water-resistant characteristics of ultraviolet crosslinked polyethylene (UV-XLPE) are investigated specially for the dependence on the hydrophilicities of auxiliary crosslinkers, which is significant to develop high-voltage insulating cable materials. As auxiliary crosslinking agents of polyethylene, triallyl isocyanurate (TAIC), trimethylolpropane trimethacrylate (TMPTMA), and N,N&prime m-phenylenedimaleimide (HAV2) are individually adopted to prepared XLPE materials with the UV-initiation crosslinking technique, for the study of water-tree resistance through the accelerating aging experiments with water blade electrode. The stress&ndash strain characteristics and dynamic viscoelastic properties of UV-XLPE are tested by the electronic tension machine and dynamic thermomechanical analyzer. Monte Carlo molecular simulation is used to calculate the interaction parameters and mixing energy of crosslinker/water binary systems to analyze the compatibility between water and crosslinker molecules. Water-tree experiments verify that XLPE-TAIC represents the highest ability to inhibit the growth of water-trees, while XLPE-HAV2 shows the lowest resistance to water-trees. The stress&ndash strain and viscoelastic properties show that the concentration of molecular chains connecting the adjacent lamellae in amorphous phase of XLPE-HAV2 is significantly higher than that of XLPE-TAIC and XLPE-TMPTMA. The molecular simulation results demonstrate that TAIC/water and TMPTMA/water binary systems possess a higher hydrophilicity than that of HAV2/water, as manifested by their lower interaction parameters and mixing free energies. The auxiliary crosslinkers can not only increase the molecular density of amorphous polyethylene between lamellae to inhibit water-tree growth, but also prevent water molecules at insulation defects from agglomerating into micro-water beads by increasing the hydrophilicity of auxiliary crosslinkers, which will evidently reduce the damage of micro-water beads on the amorphous phase in UV-XLPE. The better compatibility of TAIC and water molecules is the dominant reason accounting for the excellent water resistance of XLPE-TAIC. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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