闪蒸纺UHMWPE/HDPE共混纤维的制备及性能研究  

Preparation and properties of flash spun UHMWPE/HDPE blend fibers

作　　者：殷雨 巩岱轩 曲美洁 李金学 周红欣 唐萍[1] 王海[1] 宾月珍[1] YIN Yu;GONG Daixuan;QU Meijie;LI Jinxue;ZHOU Hongxin;TANG Ping;WANG Hai;BIN Yuezhen(Department of Polymer Materials,School of Chemical Engineering,Dalian University of Technology,Liaoning 116023;Shanghai Yingtai Medical Equipment Co.,Ltd.,Shanghai 201800)

机构地区：[1]大连理工大学化工学院高分子材料系,辽宁大连116023 [2]上海瑛泰医疗器械股份有限公司,上海201800

出　　处：《合成纤维工业》2024年第4期35-40,共6页China Synthetic Fiber Industry

摘　　要：为提高闪蒸纺纤维束的力学强度,将力学性能更为优异的超高相对分子质量聚乙烯(UHMWPE)与高密度聚乙烯(HDPE)共混,通过闪蒸纺丝方法制备UHMWPE/HDPE共混纤维束,采用扫描电子显微镜、差示扫描量热仪、X射线衍射仪和万能试验机等探究UHMWPE的引入对共混纤维束形貌、熔融结晶行为、聚集态结构和力学性能的影响。结果表明:闪蒸纺丝制备HDPE/UHMWPE共混纤维束时,随着纺丝液中UHMWPE质量分数由1%增至5%,溶液黏度增大,共混纤维束单丝直径逐渐增大,当UHMWPE质量分数为7%时,纺丝液会因黏度过大而无法纺丝;随着UHMWPE含量的增加,HDPE/UHMWPE共混纤维束的结晶度和取向度降低,力学性能增大,当纺丝液中UHMWPE质量分数为5%时,共混纤维束结晶度和取向因子分别为74.2%和0.46,拉伸强度为118.9 MPa,较纯HDPE纤维束提高了84.9%。Ultra-high relative molecular mass polyethylene/high-density polyethylene(UHMWPE/HDPE)blend fibers were prepared by blending UHMWPE with better mechanical properties with HDPE in order to improve the mechanical strength of flash spun fiber bundles via flash spinning method.The effects of UHMWPE introduction on the morphology,melt crystallization,aggregate structure and mechanical properties of the blend fiber bundles were investigated by scanning electron microscopy,differential scanning calorimetry,X-ray diffraction and universal testing machine.The results showed that the viscosity of the solution increased and the diameter of the blend fiber bundles gradually increased with increasing the mass fraction of UHMWPE from 1%to 5%in the spinning solution when preparing HDPE/UHMWPE blend fiber bundles by flash spinning,and the spinning solution would be unable to spin due to excessive viscosity when the mass fraction of UHMWPE was 7%;the crystallinity and orientation degree of HDPE/UHMWPE blend fiber bundles decreased and the mechanical properties increased with the increase of UHMWPE content;and the crystallinity and orientation degree of the blend fibers were 74.2%and 0.46,respectively,with a decrease of 4.7%and 45.7%,and the tensile strength was 118.9 MPa,which was 84.9%higher than that of pure HDPE fiber bundles,when the mass fraction of UHMWPE was 5%in the spinning solution.

关 键 词：高密度聚乙烯纤维 超高相对分子质量聚乙烯 闪蒸纺丝 聚集态结构 力学性能 

分 类 号：TQ342.61[化学工程—化纤工业] TQ342.87