混合粒径BN填充PP/PE复合材料的结构与性能

Structure and Properties of PP/PE Composites Filled with Mixed Particle Size BN

为改善聚合物基导热复合材料的导热性能,单一粒径填料填充复合材料存在的不足,因此,本文探究了混合粒径六方氮化硼(BN)掺杂聚丙烯(PP)/聚乙烯(PE)复合材料的结构、热学和力学性能。通过激光导热仪、熔融指数仪、万能电子测试机和差示扫描量热仪(DSC)进行性能测试和结构表征。结果表明,混合粒径(5μm∶20μm)BN比例为3∶2时,其制备的复合材料导热系数可达0.52 W/(m·K),较单一粒径(5μm)BN填料填充复合材料提高33.4%;弯曲强度达到46.91 MPa,弯曲模量达到3826.01 MPa,与单一粒径(5μm)BN填料填充复合材料相比,弯曲强度和弯曲模量分别提高23.34%和109.91%。将5μm粒径的BN在混合填料中的比例增加能够更有效提高复合材料的综合性能。

In order to improve the heat-conducting property of polymer based thermal conductivity composite for the single sized particles,the structure,thermal properties and mechanical properties of polypropylene/polyethylene composite materials filled with mixed particle sizes of BN Boron nitride(BN)were studied.Measurements and structural characterizations were performed utilizing laser thermal conductivity meters,melt flow index testers,universal electronic testing machines,and differential scanning calorimetry(DSC).The results show when the ratio of the mixed particle sizes of BN(5 μm∶20 μm)is 3∶2,the prepared composite material achieves a thermal conductivity coefficient of 0.52 W/(m·K),it increases 33.4%comparing with the composite filled with single-sized(5 μm)BN particles.In addition,the bending strength and modulus could reach 46.91 MPa and 3 826.01 MPa,respectively,presenting an improvement of 23.34%and 109.91%over the composites filled solely with 5 μm BN particles.It is observed that increasing the proportion of 5 μm BN particles in the mixture can more effectively enhance the overall performance of the composite material.