CIESC Journal ›› 2023, Vol. 74 ›› Issue (2): 487-499.DOI: 10.11949/0438-1157.20221089

• Reviews and monographs • Previous Articles     Next Articles

Research progress on regulation of aggregation structure for nascent polyethylene

Yuming CHEN1,2,3(), Wei LI1,2,3(), Xiang YAN1,2,3, Jingdai WANG1,2,3,4(), Yongrong YANG1,2,3,4   

  1. 1.Ningbo Innovation Center, Zhejiang University, Ningbo 315100, Zhejiang, China
    2.Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou 310027, Zhejiang, China
    3.College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
    4.State Key Laboratory of Chemical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2022-07-30 Revised:2022-10-08 Online:2023-03-21 Published:2023-02-05
  • Contact: Wei LI, Jingdai WANG

初生态聚乙烯聚集态结构调控研究进展

陈毓明1,2,3(), 历伟1,2,3(), 严翔1,2,3, 王靖岱1,2,3,4(), 阳永荣1,2,3,4   

  1. 1.浙江大学宁波科创中心,浙江 宁波 315100
    2.浙江省化工高效制造技术重点实验室,浙江 杭州 310027
    3.浙江大学 化学工程与生物工程学院,浙江 杭州 310027
    4.化学工程联合国家重点实验室(浙江大学),浙江 杭州 310027
  • 通讯作者: 历伟,王靖岱
  • 作者简介:陈毓明(1992—),男,博士,助理研究员,chenym2@zju.edu.cn
  • 基金资助:
    国家自然科学基金项目(U1862203);宁波市自然科学基金重点项目(202003N4014)

Abstract:

The aggregation structure is one of the key factors to achieve high performance of polyethylene. Starting from the design of aggregation structure of nascent polyethylene, aiming at the problems of excessive entanglement, high viscosity, difficult processing and molding of ultra-high molecular weight polyethylene (UHMWPE), the characterization and regulation of nascent polyethylene chain entanglement and its role in the high performance of polyethylene products are reviewed in this paper. The research progress on the regulation of entanglement of nascent polyethylene is reviewed from the aspects of catalyst structure design and polymerization process design, respectively. It is proposed to increase the growth spacing of active chain on the catalyst surface (spatial scale) and introduce the active chain dormancy technology assisted by nanobubbles in the polymerization process to enhance the chain crystallization rate (time scale) and reduce the“scissors difference”between “chain growth and chain crystallization”. The above two control methods provide theoretical guidance for the efficient preparation of low-entanglement polyethylene on the basis of meeting the harsh industrial production requirements.

Key words: aggregation structure, entanglement, chain crystallization, chain propagation, mechanical property, Ziegler-Natta catalyst, isolator

摘要:

聚集态结构是实现聚乙烯高性能化的关键因素之一,本文从初生态聚乙烯聚集态结构设计出发,针对初生态超高分子量聚乙烯(UHMWPE)普遍存在的缠结过多、黏度过大、加工成型困难等问题,综述了初生态聚乙烯链缠结的表征方法、调控手段及其在聚乙烯产品高性能化中的作用等研究进展。重点从催化剂结构设计和聚合工艺设计两方面介绍了初生态聚乙烯链缠结的调控方法,提出在催化剂表面增大活性链生长间距(空间尺度)和聚合过程中引入“纳微气泡辅助的活性链休眠工艺”强化链结晶速率(时间尺度),缩小“链增长-链结晶”的“剪刀差”。上述两种调控方法为满足工业苛刻的生产要求基础上,实现低缠结聚乙烯的高效制备提供了理论指导。

关键词: 聚集态结构, 缠结, 链结晶, 链增长, 力学性能, Ziegler-Natta催化剂, 阻隔剂

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