Al_(2)O_(3)和BN共混合填充PP复合材料的结构与性能

Structure and Properties of PP Composites Filled with Al_(2)O_(3)and BN

Al_(2)O_(3)和BN是聚合物基导热复合材料中常用的无机填料,但单一品种填料填充并不能使复合材料达到较好的综合性能。为此,研究了Al_(2)O_(3)和BN共混合填充聚丙烯复合材料的结构及热学和力学性能。结果发现,填料总质量分数低于20%时,共混合填充制备的复合材料的导热系数低于BN填充的复合材料,但却能提高无机填料在基体中的分散性,从而优化力学性能。当BN和Al_(2)O_(3)的添加质量分数各为10%时,弯曲模量达到2.37 GPa,比纯PP提高了103%,冲击强度达到3.25 kJ/m^(2),比纯PP提高了24%,复合材料达到刚韧平衡,综合力学性能最佳。

Al_(2)O_(3)and BN were the common inorganic fillers used in thermally conductive polymer composites.However,the composites did not have better comprehensive properties with only one kind of fillers.The structure and thermal and mechanical properties of polypropylene composites filled with Al_(2)O_(3)and BN were studied in this paper.It is found when the total mass fraction of fillers is less than 20%,the thermal conductivity of the composites prepared by adding Al_(2)O_(3)and BN is lower than that of the composite filled with BN fillers.However,the dispersion of inorganic filler in the matrix is improved,and the mechanical properties are optimized.When the mass fraction of BN and Al_(2)O_(3)is 10%,respectively,the bending modulus of PP composites reaches 2.37 GPa,which is 103%higher than that of pure PP,and the impact strength reaches 3.25 kJ/m^(2),which is 24%higher than that of pure PP.The composite has the best mechanical properties,balancing the rigidity and toughness.