Study on Thermal Conductivity and Insulation Properties of BN/PP/SEBS Composites With Bicontinuous Structure
Blending polypropylene(PP)with styrene-ethylene-butylene-styrene(SEBS)and incorporating high thermal conductivity fillers can engender superior performance of PP insulation materials.To investigate the dispersion of thermal conductive fillers within the polymer matrix and to efficaciously regulate the formation of thermal conductive networks,the present study employs different SEBS content blended with PP as the matrix,and boron nitride nanosheets(BNNSs)as the thermal conductive filler.It changes the ratio of two matrix resins,and the content of BNNSs to synthesize composite materials by melt blending.The impacts of SEBS and BNNSs content on the microstructure,thermal conductivity,variable temperature electrical conductivity,intrinsic breakdown characteristics,and mechanical properties of the composite materials are comprehensively assessed.The findings reveal that an increase in SEBS content induces a transition from a"sea-island"to a"double continuous"organic phase structure.By regulating the structure of the organic phase,the thermal conductivity of the composite material can be significantly enhanced for a given BNNSs content.The composite material not only exhibits superior thermal conductivity(0.4254 W/(m·K)),but also sustains its insulative and mechanical properties at high temperatures,thereby expanding the practical applicability of insulation materials.
万方数据
维普
