Two‐stage drawing process to prepare high‐strength and porous ultrahigh‐molecular‐weight polyethylene fibers: Cold drawing and hot drawing |
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Authors: | Hongli Liu Fei Lv Jing Li Tian Cao Caixia Wan Wenhua Zhang Liangbin Li Guoqiang Zheng Changyu Shen |
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Affiliation: | 1. Key Laboratory of Advanced Material Processing and Mold (Ministry of Education), College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, China;2. National Synchrotron Radiation Laboratory and College of Nuclear Science and Technology, Chinese Academy of Sciences Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, China |
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Abstract: | High‐strength and porous ultrahigh‐molecular‐weight polyethylene (UHMWPE) fibers have been prepared through a two‐stage drawing process. Combined with tensile testing, scanning electron microscopy, and small‐angle X‐ray scattering, the mechanical properties, porosity, and microstructural evolution of the UHMWPE fibers were investigated. The first‐stage cold drawing of the gel‐spun fibers and subsequent extraction process produced fibers with oriented lamellae stacks on the surface and plentiful voids inside but with poor mechanical properties. The second‐stage hot drawing of the extracted fibers significantly improved the mechanical properties of the porous fibers because of the formation of lamellar backbone networks on the surface and microfibrillar networks interwoven inside to support the voids. With various processing conditions, the optimized mechanical properties and porosity of the prepared UHMWPE fibers were obtained a tensile strength of 1.31 GPa, a modulus of 10.1 GPa, and a porosity of 35%. In addition, a molecular schematic diagram is proposed to describe structural development under two‐stage drawing, including void formation and lamellar evolution. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42823. |
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Keywords: | morphology polyolefins porous materials synthesis and processing structure– property relations |
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