Preparation and Insulating Properties of TiO2-Filled Polyolefin Elastomer/Polypropylene Composites
To solve the problems of insufficient mechanical properties of polypropylene(PP)at low temperature and the decrease of thermoelectric properties of binary composite materials after adding elastomers,titanium dioxide(TiO2)-filled PP/ethylene-octene copolymer elastomer(POE)composites were prepared by the melt blending method.The mechanical and dielectric properties of PP/POE/TiO2 composites with varying TiO2 contents were investigated,and the composites were characterized via scanning electron microscopy(SEM)and synchronous thermal analysis.Mechanical property tests show that the addition of TiO2 significantly improves the mechanical properties of the composites.The composite tensile strengths increase compared to that of PP/POE without TiO2.The elongation at break of PP/POE/1.5TiO2 reaches maximum when the TiO2 content is 1.5 phr.Dielectric property tests indicate that the addition of TiO2 effectively suppresses space charge accumulation and increases the dielectric constant of the composites.The PP/POE/1.5TiO2 composite exhibits the best space charge suppression ability at a TiO2 content of 1.5 phr,without significantly affecting the dielectric loss.Synchronous thermal analysis reveals that the addition of POE reduces the crystallinity and melting temperature of the composites.The addition of TiO2 has little effect on the crystallization and melting temperatures of the composites,while higher contents of TiO2 could increase the crystallinity of the composites.At a TiO2 content of 1.5 phr,the PP/POE/1.5TiO2 composite maintains the mechanical properties of the PP/POE composite while balancing the electrical and thermal properties of the PP substrate.This material provides a basis for the development of new environmentally friendly insulating PP cable insulation materials.
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