以聚丙烯为基材，六方氮化硼为填料，添加马来酸酐接枝聚丙烯，利用双螺杆挤出机制备导热复合材料.采用X射线衍射、扫描电子显微镜表征材料的微观结构，对复合材料的结晶性能、力学性能和导热性能进行分析.结果表明，马来酸酐接枝聚丙烯有利于增加聚丙烯与氮化硼的界面粘结，改善复合材料的结晶，增强复合材料拉伸强度和断裂伸长率，显著提高其热导率.氮化硼含量为30％(质量分数)时，添加马来酸酐接枝聚丙烯的复合材料热导率为0．512 W/(m?K)，相对于只添加氮化硼的复合材料和聚丙烯，热导率分别提高1．08和2．3倍.
Hexagonal boron nitride (h-BN)and maleic anhydride grafted polypropylene(PP-g-ma)were simulta-neously blended with polypropylene (PP)to fabricate thermally conductive composites using a twin-screw ex-truder.The microstructure of the composites was analyzed with X-ray diffraction (XRD)and scanning electron microscope (SEM).The crystallization properties,mechanical properties and thermal properties of the compos-ites were investigated.The results show that the crystallization is improved,the elongation at break and tensile strength enhanced,and the thermal conductivity improved significantly,because of strong interaction between h-BN and PP chained by PP-g-ma.When the content of h-BN is 30wt%,the thermal conductivity of the PP/h-BN composite containing additional PP-g-ma is 1.08 times to the value of PP/h-BN composite and as high as 2.3 times to that of PP.
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