【作者】 刘莉；

【导师】 张文龙； 张冬琴；

【作者基本信息】 哈尔滨理工大学 ， 材料工程， 2005， 硕士

【摘要】 本文采用共混方法对聚丙烯(PP)进行了改性研究,通过添加成核剂、硫化方法,对EPDM、BR增韧PP体系的力学性能以及其结晶形态和结晶动力学做了较深入的研究,并用DSC、相差显微镜对增韧聚丙烯进行了分析。结果表明:橡胶的硫化,特别是与PP的接枝,大幅度提高了与PP间的相容性及对PP的成核作用;硫化体系比非硫化体系大幅度提高了改性PP的耐冲击强度,具有高流动,高抗冲性能;乙撑双硬脂酰胺为PP的良好成核剂,它对PP的屈服强度、室温缺口冲击强度有一定的提高,特别是室温无缺口冲击强度有很大的贡献,但对PP的耐低温冲击影响不大;乙撑双硬脂酰胺对PP/EPDM、PP/BR共混体系性能的影响是不相同,EPDM在高份数时,乙撑双硬脂酰胺对PP/EPDM体系体现出良好的成核作用,对冲击强度贡献很大,EPDM在低份数下,乙撑双硬脂酰胺起不到良好的成核作用;乙撑双硬脂酰胺对PP/BR共混体系有良好的成核作用,与没有成核剂的PP/BR共混体系相比,PP的耐冲击性得到较大幅度的提高;橡胶用量在低份数下(12phr以下),来源广、价格低的BR可以代替EPDM对PP的增韧改性,制备出的高抗冲PP材料;经在汽车工程材料上的实际应用,证明其性能完全满足汽车配件的使用要求。更多还原

【Abstract】 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.更多还原