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首页> 外文期刊>Journal of Applied Polymer Science >Two-stage drawing process to prepare high-strength and porous ultrahigh-molecular-weight polyethylene fibers: Cold drawing and hot drawing
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Two-stage drawing process to prepare high-strength and porous ultrahigh-molecular-weight polyethylene fibers: Cold drawing and hot drawing

机译：分两步拉伸制备高强度和多孔超高分子量聚乙烯纤维的方法：冷拉伸和热拉伸

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摘要

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. (C) 2015 Wiley Periodicals, Inc.
机译：高强度和多孔的超高分子量聚乙烯（UHMWPE）纤维是通过两步拉伸过程制备的。结合拉伸测试，扫描电子显微镜和小角度X射线散射，研究了UHMWPE纤维的力学性能，孔隙率和微观结构演变。凝胶纺丝纤维的第一阶段冷拉伸和随后的提取过程产生的纤维表面具有定向的薄片叠层，内部具有大量空隙，但机械性能较差。由于在表面上形成了层状主干网，并且内部交织以支撑空隙的微原纤维网络，提取纤维的第二阶段热拉伸显着改善了多孔纤维的机械性能。在各种加工条件下，制得的UHMWPE纤维的最佳机械性能和孔隙率均获得了1.31 GPa的拉伸强度，10.1 GPa的模量和35％的孔隙率。此外，提出了分子示意图来描述两阶段绘图下的结构发展，包括空隙形成和层状演化。 （C）2015年Wiley Periodicals，Inc.

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