Particle morphology, structure and properties of nascent ultra-high molecular weight polyethylene

Author:

Zhang Wenyang1ORCID,Wu Zhengwen1,Mao Hanjun1,Wang Xinwei1,Li Jianlong1,Mai Yongyi1,Yu Jianyong2

Affiliation:

1. State Key Laboratory of Polyolefins and Catalysis, Shanghai Key Laboratory of Catalysis Technology for Polyolefins, Shanghai Research Institute of Chemical Industry, Shanghai 200062, People's Republic of China

2. School of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China

Abstract

The effects of particle morphology on the structure and swelling/dissolution and rheological properties of nascent ultra-high molecular weight polyethylene (UHMWPE) in liquid paraffin (LP) were elaborately explored in this article. Nascent UHMWPE with different particle morphologies was prepared via pre-polymerization technique and direct polymerization. The melting temperature and crystallinity of UHMWPE resins with different particle morphologies were compared, and a schematic diagram was proposed to illustrate the mechanism of UHMWPE particle growth synthesized by pre-polymerization method and direct polymerization. The polymer globules in the nascent UHMWPE prepared by using pre-polymerization technique are densely packed and a positive correlation between the particle size and the viscosity-averaged molecular weight can be observed. The split phenomenon of particles and the fluctuation in the viscosity of UHMWPE/LP system prepared by direct polymerization can be observed at a low heating rate and there is no correlation between particle size and viscosity-averaged molecular weight.

Funder

Ministry of Science and Technology of the People's Republic of China

Publisher

The Royal Society

Subject

Multidisciplinary

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