摘要
通过将聚丙烯(polypropylene,PP)与弹性体(styrene-ethylene-butylene-styrene,SEBS)材料共混并掺杂高导热填料可提高PP绝缘材料的使用性能.为了研究导热填料在聚合物基体中的分散规律,有效调控导热网络的形成,该文将不同含量SEBS与PP共混作为基体,以氮化硼纳米片(boron nitride nanosheets,BNNSs)为导热填料,改变2种基体树脂的比例、BNNSs 含量,通过熔融共混,制备出复合材料,分别探究SEBS与BNNSs含量对复合材料的微观结构、热导率、变温电导特性、本体击穿特性和力学性能的影响.结果显示:随着SEBS比例的增加,有机相逐渐由"海岛"结构转变为"双连续"结构,相同BNNSs含量下,调控有机相结构,可显著提升复合材料热导率.复合材料不仅具有良好的导热性能(0.425 4 W/(m·K)),且保证了自身在高温下的绝缘性能以及机械性能,拓展了绝缘材料的实用性.
Abstract
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.
维普
万方数据