Study On The Toughened Polypropylene

In this paper, polypropylene(PP) was modificated in property by blending method. And mechanical property, crystalline morphology and crystallization kinetics were deeply studied about PP/EPDM and PP/BR systems where the rubber were vulcanized and the nucleator was adopted also. The toughened polypropylene was analysized by DSC and Phase differential micrographs technologies. The compatibility between rubber and PP and nuclearing effect were improved when the rubber was vulcanized and grafted into PP, sothat the modificatied PP possessinghigh flow behavior and high impact resilience. SF, which is the good nucleator, had an large contribution to hightened the yield strength and room temperature notch yield strength of PP, but had little impact on low temperature yield strength. The impacts were different, on which was nucleator put PP/EPDM and PP/BR systems. When the EPDM content is large, the nucleator had an good nuclearing function to PP/EPDM blend system. When the content is low, the function of nuclearitation is not good. Compared with the PP/BR system without nucleator, there was an good nuclearing function in PP/BR system with nucleator and the impact resilience of PP had been hightened extentedly. When the BR content is lower than 12 phr, the BR could instead of EDPM in fact of toughened modification to PP. It was proved that the fittings prepared by PP material of high impact resilience completely satisified the requirement of automobile industry.