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通过熔融共混法制备了聚丙烯(PP)／SiO_2纳米复合材料,并使用扫描电镜(SEM)、电子拉力机和冲击机等对材料进行表征。研究发现硅烷偶联剂对纳米SiO_2在聚丙烯(PP)中的分散起一定的作用,但不是非常有效。添加相容剂PP-g-MAH后,可以使纳米SiO_2均匀地分散于PP中。当纳米SiO_2含量为2重量份时,PP／SiO_2纳米复合材料的性能最优,与纯PP相比较,Izod冲击强度提高了90％,拉伸强度略微提高了5％,弯曲强度提高了23%。最后,作者对纳米SiO_2的增韧机理和PP-g-MAH大幅度改善纳米SiO_2在PP中分散效果的机理作了初步推断。
Polypropylene (PP) / SiO 2 nanocomposites were prepared by melt blending method. The materials were characterized by scanning electron microscopy (SEM), electronic tensile and impact machines. It has been found that the silane coupling agent plays a role in the dispersion of nano-SiO 2 in polypropylene (PP), but it is not very effective. After adding compatibilizer PP-g-MAH, nano-SiO 2 can be uniformly dispersed in PP. The performance of PP / SiO 2 nanocomposites was the best when the content of nano-SiO 2 was 2 parts by weight. Compared with pure PP, Izod impact strength increased by 90%, tensile strength increased slightly by 5% and flexural strength by 23% . Finally, the author made preliminary inferences about the toughening mechanism of nano-SiO 2 and the mechanism that PP-g-MAH greatly improves the dispersion effect of nano-SiO 2 in PP.