中文摘要：

以聚丙二醇600（PPG600）为液体分散介质，以纳米二氧化硅（nano-SiO2）为分散相粒子制备PPG600体系的剪切增稠流体（PPG—STF），并对其进行包裹得到芯材为PPG—STF的微胶囊。在此基础上，将PPG-STF微胶囊与聚丙烯（PP）熔融共混，通过PPG—STF的剪切增稠特性对PP进行增韧。研究了PPG—STF的流变性能、PPG—STF微胶囊的粒径分布和表观形貌，以及PPG—STF微胶囊对PP的增韧效果及其作用机理。结果表明：PPG—STF在大于1Hz的振荡频率下具有明显的增稠效应；PPG—STF微胶囊增韧PP的冲击强度最大可达到纯PP的3．5倍。

英文摘要：

Shear thickening fluids were prepared with nano-SiO2 as dispersed phase particle and PPG 600 as liquid dispersion medium. Then a series of mierocapsules containing PPG-STF were synthesized. On this basis, PP was melt blended with microcapsules containing PPG-STF, which could play the toughening effect on matrix through shear thickening effect. Rheological behavior of PPG-STF, particle size distribution and morphology of PPG-STF microcapsules were investigated. Meanwhile, the toughening effect and mechanism of PPG-STF microcapsules on PP were researched. The results showed that shear thickening effeet of PPG-STF was evident under oscillation frequency larger than 1 Hz, the maximum impact strength of PP toughened by PPG-STF microeapsule could reach 3.5 times that of the pure PP.