PP-g-MAH/改性高岭土复合材料的制备与性能

Preparation and Properties of Polypropylene Grafted Maleic Anhydride/Surface Modified Kaolin Composites

利用γ-氨丙基三乙氧基硅烷偶联剂(KH550)对高岭土(kaolin)进行表面改性,制备了改性kaolin(M-kaolin),然后将聚丙烯(PP)接枝上顺丁烯二酸酐(MAH),制备了PP-g-MAH,将两者经过熔融共混制备了PP-gMAH/M-kaolin复合材料,研究了M-kaolin添加量对复合材料力学性能和热稳定性的影响。结果表明,当M-kaolin粒子质量分数为1%时,PP-g-MAH/M-kaolin复合材料的拉伸强度和断裂伸长率达到最大值,与纯PP相比分别提高了10.4%和122%;当M-kaolin粒子质量分数为2%时,复合材料的缺口冲击强度达到最大值,较纯PP提高了96.5%,且热稳定性最好。这表明kaolin粒子经KH550改性且PP经MAH接枝后,PP与kaolin相容性得到优化,从而使复合材料的强度和韧性都得到了提高。

γ-aminopropyltriethoxysilane （KH550） was used to modify kaolin for preparing surface modified kaolin （M-kaolin） and polypropylene （PP） was grafted with MAH for preparing PP-g-MAH, then a series of PP-g-MAH / M-kaolin composites were prepared by melt blending method. The results show that when the mass fraction of M-Kaolin is 1%, the tensile strength and elongation at break of the composite reach the maximum and improves by 10.4% and 122% respectively comparing with PP, when the mass fraction of M-Kaolin is 2%, the composite has the highest impact strength and improves by 96.5% comparing with PP, meanwhile, it＇s thermal stability is best. These indicate that kaolin being modified by KH550 and PP being grafted with MAH can optimize the compatibility of kaolin and PP and improve the strength and toughness of the composite.