石油化工2025，Vol.54Issue(10)：1439-1444,6.DOI:10.3969/j.issn.1000-8144.2025.10.008
车用抗冲聚丙烯分子结构对流变行为影响
Influence of molecular structure of automotive impact polypropylene copolymer on rheological behavior
罗文 1郭晓帅 1腾娜 1李涛 1林华杰1
作者信息
- 1. 中石化宁波新材料研究院有限公司,浙江 宁波 315200
- 折叠
摘要
Abstract
Molecular structures of three automotive impact polypropylene copolymers(IPC)were investigated by FTIR,SEM,and GPC techniques,complemented by dynamic rheological testing conducted with a rotational rheometer,so as to analyze the factors influencing material surface gloss.Experimental results reveal that while the three automotive IPC exhibit similar melt flow rates and comparable molecular chain segment structures with minimal differences in rubber phase morphology,they demonstrate distinct molecular weight distributions.The rubber phase content in descending order is as follows:IPC-1>IPC-3>IPC-2.IPC-2 and IPC-3 exhibit lower ethylene content in their molecular chains and a higher proportion of small-sized rubber phases,resulting in superior gloss properties compared to IPC-1.Furthermore,IPC-2 and IPC-3 demonstrate enhanced phase separation between the rubber phase and homogeneous phase,along with a higher content of high molecular weight components.These high molecular weight components form a relaxation-restricted"network skeleton"through chain entanglement,with long-term relaxation units effectively inhibiting molecular chain deformation,thereby promoting uniform surface crystallization and achieving high gloss characteristics.关键词
抗冲聚丙烯/分子量分布/动态流变/松弛受限Key words
resistant polypropylene copolymer/molecular weight distribution/dynamic rheology/restricted relaxation分类
化学工程引用本文复制引用
罗文,郭晓帅,腾娜,李涛,林华杰..车用抗冲聚丙烯分子结构对流变行为影响[J].石油化工,2025,54(10):1439-1444,6.
