PP树脂的加工流变行为研究进展  

Research Progress on Processing Rheological Behavior of PP Resins

作　　者：李泽芾 杨世元[2] 陈振斌[1] LI Ze-fu;YANG Shi-yuan;CHEN Zhen-bin(College of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina,Lanzhou 730060,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]中国石油天然气股份有限公司石油化工研究院兰州化工研究中心,甘肃兰州730060

出　　处：《塑料科技》2023年第7期104-109,共6页Plastics Science and Technology

摘　　要：聚丙烯(PP)作为通用的热塑性树脂,因其质轻、易于加工成型和化学稳定性好等特点,被广泛应用于车辆、医疗和建筑等领域。文章综述了相对分子质量及相对分子质量分布、支化结构和加工工艺对PP流变行为的影响。结果表明:相对分子质量较高并且相对分子质量分布较宽的PP在低频时黏度较大,剪切变稀最明显;支链结构的引入有助于提高PP的熔体强度,并且使其黏流活化能增高,应变硬化程度也随支链含量的增加而增加;随着剪切速率的增加,PP熔体的表观剪切黏度下降呈现出假塑性流体典型的“剪切变稀”行为。Polypropylene(PP),a general-purpose thermoplastic resin,is widely used in vehicles,medical and construction applications because of its light weight,ease of processing and molding,and good chemical stability.The effects of molecular weight and molecular weight distribution,branching structure and processing technology on the rheological behavior of PP are reviewed.The results show that PP with higher molecular weight and wider molecular weight distribution has higher viscosity at low frequency,and the shear thinning is the most obvious.The introduction of branched chain structure helps to improve the melt strength of PP,and increases its viscous flow activation energy,and the degree of strain hardening also increases with the increase of branched chain content.With the increase of shear rate,the apparent shear viscosity of PP melt decreases,showing a typical 'shear thinning' behavior of pseudoplastic fluid.

关 键 词：聚丙烯 流变行为 加工工艺 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]