熔纺PE-UHMW/PE-HD共混纤维的力学性能和晶体结构研究  

Study on mechanical properties and crystal structure of melt-spun PE-UHMW/PE-HD fibers

作　　者：王非 刘丽超 薛平[2] WANG Fei;LIU Lichao;XUE Ping(School of Artificial Intelligence,Beijing Technology and Business University,Beijing 100048,China;College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京工商大学人工智能学院,北京100048 [2]北京化工大学机电工程学院,北京100029

出　　处：《中国塑料》2022年第1期47-52,共6页China Plastics

基　　金：北京市自然科学基金资助项目(2204078)。

摘　　要：通过熔融纺丝工艺制备了拉伸强度为1.13 GPa的超高分子量聚乙烯(PE-UHMW)/高密度聚乙烯(PE-HD)共混纤维。采用差示扫描量热仪(DSC)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、声速取向测试、纤维强度测试等方法研究了初生丝和纤维的晶体结构及力学性能。结果表明,将PE-UHMW与低熔体流动速率(MFR)的PE-HD共混后,提高了共混纤维的分子链取向度、结晶度及力学性能;由高度取向的分子链形成的晶粒可以在轴向上被有效拉伸,形成更规则和致密的晶体结构,从而提高了纤维的力学性能。Ultra-high molecular weight polyethylene(PE-UHMW)and high-density polyethylene(PE-HD)blend fibers with tensile strength of 1.13 GPa were prepared via a melt spinning process.The crystal structure and mechanical properties of the as-spun filaments and fibers were investigated using differential scanning calorimetry(DSC),scanning electron microscopy(SEM),X-ray diffraction(XRD),sound velocity orientation test and tensile strength test.The results indicated that the degree of molecular chain orientation,crystallinity,and mechanical properties of the blend fibers were improved by blending with PE-HD having a low melt flow index(MFR).For this type of blend fibers,their crystal grains formed by more highly oriented molecular chains could be stretched more effectively in the drawing direction,resulting in an improvement in mechanical properties due to a more regular and compact crystal structure.

关 键 词：超高分子量聚乙烯 熔融纺丝 共混纤维 晶体结构 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]