Membrane Science and Technology

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Preparation and structure study of crosslinked polyethylene microporous membrane

Authors： REN Dongxue, SUN Xiaojie

Units： National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China

KeyWords： crosslinked polyethylene; microporous membrane

ClassificationCode：TQ316.6

year,volume(issue):pagination： 2021, 41(1):50-56

Abstract：

Cross-linked polyethylene microporous membranes were prepared by a new stretching process including hot stretching, high temperature annealing and cold drawing. The process conditions such as cross-linking degree, stretching temperature, annealing temperature and cold drawing of cross-linked polyethylene were investigated. The effect of the pore-forming performance of polyethylene microporous membrane, the pore-forming process and mechanism were discussed. The degree of cross-linking of cross-linked polyethylene significantly affects the pore-forming performance. As the degree of cross-linking increases, the porosity increases. When the stretching temperature is between 90 ° C and 120 ° C, the membrane is basically composed of fibrous crystals. The stretching temperature was raised to 130 ° C and high-temperature annealing treatment was performed at this temperature, the film began to appear fine slit-shaped micropores. The application of cold-drawing can regulate the morphological evolution of the slit-shaped micropores, which are further stretched into circular or elliptical micropores. The new stretching process provides a new idea for the preparation of high-performance polyethylene microporous membranes.

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AuthorIntro：

任冬雪，女，硕士，北京低碳清洁能源研究所，主管工程师，主要研究方向为先进材料功能膜的制备和应用研究，email: dongxue.ren@chnenergy.com.cn

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