煤系高岭土经过硅烷偶联剂表面改性后,与聚丙烯（PP）树脂熔融共混制备出聚丙烯/改性煤系高岭土复合材料。通过X射线衍射、红外光谱、力学性能和扫描电镜分析,研究了改性煤系高岭土的填充量对复合材料力学性能的影响。结果表明,利用硅烷偶联剂可以实现煤系高岭土的表面改性。改性煤系高岭土填充量为3%时,复合材料具有最佳的冲击韧性。填充量为5%时,复合材料的断裂伸长率达到最大值。随着改性煤系高岭土填充量的增加,复合材料的弯曲强度和弯曲模量逐渐增大,填充量为10%时,二者比纯PP分别提高14.5%和27.5%。
Kaolin from coal measures was modified by silane coupling agent.Using polypropylene(PP) and modified kaolin as raw materials,the PP/modified kaolin composites were prepared with a melt-blending method.XRD,FT-IR,SEM and the mechanical properties testing were used to characterize the modification of kaolin and the effect of filling content of modified kaolin on the mechanical properties of the composites.The results show that the surface modification of kaolin is successful.The optimum impact toughness is achieved with 3 % modified kaolin filling,while the elongation at break of the composite filled with 5% modified kaolin reaches the maximum value.The flexural strength and the flexural modulus of the composites increase with the content of modified kaolin increasing.For the composites filled with 10 % modified kaolin,these values are increased by 14.5% and 27.5%,respectively,comparing with those of pure PP.
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