载体包裹填料提高PE/PP/EPDM/BN材料导热性

以三元乙丙橡胶(EPDM)/氮化硼(BN)复合材料为母料,通过熔融共混EPDM/BN复合材料与聚乙烯(PE)、聚丙烯(PP),制备PE/PP/EPDM/BN复合材料。采用PE∶PP的比例为5∶5,以使复合材料形成共连续结构;通过EPDM包裹BN的方法,实现BN在PE/PP/EPDM/BN复合材料共连续结构的相界面处分布,以形成导热通路,从而提高PE/PP/EPDM/BN复合材料的导热性能。通过接触角测试和扩散系数公式计算预测了EPDM会选择性分布在PE/PP/EPDM复合材料共连续结构的相界面处。通过连续度计算结果得出,EPDM为PE和PP总质量的15%时,EPDM的连续度为85.3%。由扫描电子显微镜分析表明EPDM在PE/PP/EPDM/BN复合材料中连续贯通。由导热测试分析知,随着BN含量的增加,PE/PP/EPDM/BN复合材料的热导率逐渐增加。这项研究提高了PE/PP复合材料的热导率,此材料在电子工业中可能具有潜在应用。

Carrier Wrapped Filler Improves the Thermal Conductivity of PE/PP/EPDM/BN Composites

Polyethylene(PE)/polypropylene(PP)/ethylene propylene diene monomer(EPDM)/BN composites were prepared by melt blending EPDM/BN composites with PE and PP by using EPDM/BN composites as masterbatch.In this experiment,the ratio of PE∶PP is 5∶5 to make the composite material form a co-continuous structure.Through the method of EPDM wrapping BN,BN is distributed at the phase interface of the PE/PP/EPDM/BN composite co-continuous structure to form a thermal path,thereby improving the thermal conductivity of the PE/PP/EPDM/BN composite material.The contact angle test and the calculation of the diffusion coefficient formula predict that EPDM will be selectively distributed at the phase interface of the PE/PP/EPDM composite co-continuous structure.According to the results of continuity calculation,when EPDM is 15%of the total mass of PE and PP,the continuity of EPDM is 85.3%.Scanning electron microscopy analysis shows that EPDM is continuous in the PE/PP/EPDM/BN composite.According to the analysis of thermal conductivity,with the increase of BN content,the thermal conductivity of PE/PP/EPDM/BN composites gradually increases.This research improves the thermal conductivity of PE/PP composites,which may have potential applications in the electronics industry.