Enhancing Gel Spinning of Ultra-High Molecular Weight Polyethylene: Insights into Rheology and Microstructure

IF 2.2 4区 工程技术 Q1 MATERIALS SCIENCE, TEXTILES
Yu Zhang, Xiang Yan, Xin Tang
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Abstract

In this investigation, we assessed the influence of entanglement density on the gel spinning process for producing ultra-high molecular weight polyethylene (UHMWPE) ultrafine fibers with high tensile strength and modulus. Using a semi-dilute solution spinning technique in paraffin oil and including swelling and thermal drawing stages, we discovered that low-entanglement UHMWPE achieves swelling equilibrium more effectively and swells at a faster rate than highly entangled variants, facilitating enhanced drawability, and reduced entanglement. Rheological testing was used to estimate ultimate draw ratios, revealing that low-entanglement UHMWPE could be drawn up to 101 times, which is 1.8 times greater than fibers from highly entangled materials of comparable molecular weight. The fibers spun from low-entanglement UHMWPE demonstrated a tensile strength of 4.2 GPa and an initial modulus of 163.9 GPa, showing improvements of 18% and 68% respectively, compared to their highly entangled counterparts. With a fiber diameter of 7.1 μm, these results show significant enhancements in swelling and thermal drawing processes achievable with low-entanglement UHMWPE, resulting in superior high-performance ultrafine fibers with exceptional processability.

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来源期刊
Fibers and Polymers
Fibers and Polymers 工程技术-材料科学:纺织
CiteScore
3.90
自引率
8.00%
发文量
267
审稿时长
3.9 months
期刊介绍: -Chemistry of Fiber Materials, Polymer Reactions and Synthesis- Physical Properties of Fibers, Polymer Blends and Composites- Fiber Spinning and Textile Processing, Polymer Physics, Morphology- Colorants and Dyeing, Polymer Analysis and Characterization- Chemical Aftertreatment of Textiles, Polymer Processing and Rheology- Textile and Apparel Science, Functional Polymers
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