摘要
选择了五种茂金属聚烯烃 (POE)树脂 ,对一种共聚型聚丙烯 (Co PP)和两种均聚型聚丙烯 (Ho PP1和Ho PP2 )进行增韧改性。通过系统研究PP/POE共混体系的微观形态和冲击性能 ,发现POE在不同PP基体中的增韧效果不同 ,其中Co PP/POE共混体系发生脆韧转变要早于Ho PP/POE共混体系 ,所有PP/POE共混体系常温时发生脆韧转变要早于低温时 ;POE结构对PP/POE共混体系的微观形态和冲击性能亦有较大影响 ,其中POE 2和POE 3对PP的增韧效果较好 ,而POE 4和POE 5对PP的增韧效果则相对较差。此外 ,通过观察Co PP/POE 2共混体系的冲击断面形貌 ,发现POE对PP的增韧主要依靠弹性体诱发大量银纹与剪切带耗散冲击能 ,符合银纹
Five metallocene polyolefin elastomers (POE) were selected to toughen one kind of copolymerized polypropylene (Co-PP) and two kinds of homopolymerized polypropylenes (Ho-PP1 and Ho-PP2). Through studying the morphology and impact properties of PP/POE blend systems, it was found that the toughening effect of POE on different PP matrixes was quite different. The brittle-ductile transition of Co-PP/POE systems occured earlier than that of Ho-PP/POE systems and the brittle-ductile transition of all PP/POE systems occurred earlier at ambient temperature than at cryogenic temperature. At the meantime, the effect of different POE on the morphology and impact property of Co-PP/POE systems was also obvious. Among the five kinds of POE, POE-2 and POE-3 exhibited well toughening effect on Co-PP, and POE-4 and POE-5 exhibited poor toughening effect on Co-PP. By addition, from the SEM photos of the impact fractures of PP/POE systems, it was also found that there were many crazing and shear yielding on the fractures which implied that the toughening mechanism of PP/POE systems was subjected to the theory of crazing with shear yielding.
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
2003年第1期24-28,共5页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
齐鲁石化股份有限公司资助项目
