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采用熔融共混法制备了聚丙烯(PP)/纳米二氧化硅(nano-SiO_2)复合材料,用偏光显微镜、差示扫描量热仪研究了PP/nano-SiO_2复合材料的凝聚态结构,并用扫描电子显微镜、透射电子显微镜观察了nano-SiO_2粒子在PP中的相容性和分散性。结果表明,分散于PP中的nano-SiO_2粒子影响了PP的凝聚态结构,球晶尺寸变小,球晶边界模糊,PP的结晶和熔融温度分别增加了6.5%和2.6%;PP/nano-SiO_2复合材料在硅烷偶联剂(KH-560)与增容剂马来酸酐接枝聚丙烯(PP-g-MAH)的协同作用下,nano-SiO_2粒子在PP基体中的相容性增加,粒子与基体界面结合良好,团聚少,分散好,PP的冲击强度增加了40%。
Polypropylene (PP) / nano-SiO 2 composites were prepared by melt blending method. The condensed structure of PP / nano-SiO 2 composites was investigated by polarized light microscopy and differential scanning calorimetry. Scanning electron microscopy, transmission electron microscopy were observed nano-SiO 2 particles in the PP compatibility and dispersion. The results showed that the nano-SiO 2 particles dispersed in PP affected the condensed state of PP, the spherulite size became smaller, the spherulite boundaries became fuzzy, the crystallization and melting temperature of PP increased by 6.5% and 2.6%, respectively. SiO 2 composites, the compatibility of nano-SiO 2 particles in PP matrix increased with the synergistic effect of silane coupling agent (KH-560) and compatibilizer (PP-g-MAH) The interface between the particles and the matrix is well bonded, with less agglomeration and good dispersion, and the impact strength of PP is increased by 40%.