纳米SiO_2/聚丙烯复合材料的反应性增容

利用反应性增容技术制备了纳米二氧化硅/聚丙烯复合材料.首先探讨了将甲基丙烯酸缩水甘油酯-丙烯酸丁酯共聚物接枝到纳米二氧化硅粒子表面进行改性的各种影响因素,然后将接枝改性纳米二氧化硅与聚丙烯以及作为反应性增容剂的氨基化聚丙烯共混.结果表明,改性粒子上的环氧基与氨基化聚丙烯上的氨基之间的化学反应大大增强了复合材料的界面作用,从而在粒子含量很低时明显提高了聚丙烯的拉伸强度、模量和冲击强度.

REACTIVE COMPATIBILIZATION OF NANO-SILICA/POLYPROPYLENE COMPOSITES

Demonstrated the feasibility of improving mechanical performance of nano-silica/polypropylene(PP)composites by reactive compatibilization.That is,nano-silica particles were grafted by a copolymer of glycidyl methacrylate and butyl acrylate,which were then compounded with PP and the reactive compatibilizer aminated PP.Accordingly,a stronger interfacial adhesion was obtained as characterized by both dynamic mechanical analysis and crystallization behaviors.It helped to give full play to the nanoparticles for toughening and strengthening PP.The factors that influence the graft polymerization and the effect of reactive compatibilization on the properties of nano-silica/PP composites were studied in detail.The results showed that tensile strength,Young's modulus and notch impact strength of PP can be increased at rather low nano-silica contents.