Abstract
In this study an effective surface functionalization of fumed nano-silica for dielectric insulation composites is developed. A three step modification procedure was applied: 1. Silanization of the silica surface with (3-glycidoxypropyl)trimethoxysilane (GOPTMS); 2. Grafting of an acrylonitrile-butadiene telechelic oligomer terminated with two carboxylic acid groups (o-NBR); 3. Hydrogenation of the unsaturated polybutadiene segments for better compatibilization with the saturated polyolefin matrices and for higher dielectric performance.The deposition of the coupling system was monitored by thermogravimetric analysis (TGA) revealing 6.4 wt. % of GOPTMS and 13.6 wt. % of o-NBR bond to the silica, resulting in an exceptionally high total deposition (20.0 wt. %). The o-NBR grafting was analyzed qualitatively by Fourier transform infrared spectroscopy (FTIR) showing successful deposition of o-NBR and effective hydrogenation.The silica modified according to this procedure is a promising functional nano-filler for high-voltage insulation composites allowing improved dispersion and distribution in polyolefine matrices and therefore enhancing their electrical properties.
Highlights
IntroductionRecent progress in diversification of electric energy generation sources and development of smart grids has triggered the need of designing innovative materials for high-voltage current transmission applications
Recent progress in diversification of electric energy generation sources and development of smart grids has triggered the need of designing innovative materials for high-voltage current transmission applications.Thermoplastic polyolefins, such as polyethylene (PE), polypropylene (PP) or poly(ethylene-co-octene) (POE), exhibit good dielectric and insulating properties, which make them ideal candidates for high voltage applications
In this study we present a novel approach for an effective surface functionalization of fumed silica for polyolefin-based nano-dielectric composite preparation
Summary
Recent progress in diversification of electric energy generation sources and development of smart grids has triggered the need of designing innovative materials for high-voltage current transmission applications. Thermoplastic polyolefins, such as polyethylene (PE), polypropylene (PP) or poly(ethylene-co-octene) (POE), exhibit good dielectric and insulating properties, which make them ideal candidates for high voltage applications. A local temperature rise could be dangerously close to the melting temperature of non-cross-linked PE This results in inability of effective material recycling of the XLPE insulator after its use [1]. PP exhibits a significantly higher melting temperature than PE (~160 °C versus ~110 °C, respectively), its elasticity is limited necessitating its copolymerization or blending with more flexible polyolefins (like POE) in order to achieve a satisfactory level of elasticity
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