Thermal and electrical insulation properties of BN‐filled polymer‐based elastomer composites

Abstract

AbstractTo make the current charging time of electric vehicles meet the technical requirements of rapid charging, the higher the charging current needs to be increased. Consequently, higher requirements are put forward for the heat dissipation capacity of the charging pile cable. Therefore, obtaining insulation materials with good electrical and thermal properties is vital to solving the heat dissipation problem of charging pile cables. This paper modified polypropylene (PP) with polystyrene‐ethylene‐butadiene‐styrene (SEBS). Boron nitride nanosheets (BNNS) and boron nitride nanospheres (BNNOS) were used as thermally conductive fillers to construct A‐B‐A‐B … A type thermally conductive pathways in SEBS/PP matrix. In SEM tests, it can be observed that the orientation of BNNS along the direction perpendicular to the pressure increases. DSC tests show that the introduction of BN particles lowers the melting point of the SEBS/PP matrix and increases the crystallization temperature of the composite. In the thermal conductivity experiment, with the rise of the content of BNNOS and the number of multilayer structures, the thermal conductivity gradually increases, up to 0.514 W/m K, which is three times the thermal conductivity of the SEBS/PP matrix. The tensile strength and elongation at the break of the composites decrease but the change of conductivity is not obvious.