拉伸温度对UHMW-PE/HDPE共混纤维结晶性能的影响  

Effect of Hot-Drawing Temperature on Crystalline Characters of UHMW-PE/HDPE Blend Fibers

作　　者：王非[1] 刘丽超[1] 薛平[1] 贾明印[1] 王苏炜 WANG Fei;LIU Lichao;XUE Ping;JIA Mingyin;WANG Suwei(Institute of Plastic Machinery and Engineering, Beijing University of Chemical Technology, Beijing 100029, China)

机构地区：[1]北京化工大学塑料机械及塑料工程研究所,北京100029

出　　处：《塑料》2018年第3期76-79,共4页Plastics

基　　金：国家自然科学基金资助项目(51673021);双一流建设专项经费资助(PY201609)

摘　　要：通过熔融纺丝工艺成功制备了超高分子量聚乙烯(UHMW-PE)/高密度聚乙烯(HDPE)共混初生丝,并将初生丝在不同温度下进行高倍率热拉伸制得UHMW-PE/HDPE共混纤维。采用广角X射线衍射(WAXD)、差示扫描量热(DSC)、拉伸试验等方法探讨了不同热拉伸温度下获得的UHMW-PE/HDPE共混纤维的微观结构及力学性能。结果表明,在85℃下拉伸所得的纤维具有最高的结晶度、结晶取向度以及最细长的晶粒形状,纤维的力学性能也最优。太低的拉伸温度不利于纤维的分子链以及晶体结构沿轴向取向,太高的拉伸温度则不利于纤维的晶体结构在拉伸过程中进行重组,因此太低或太高的拉伸温度均不利于纤维力学性能的提升。The ultra-high molecular weight polyethylene （UHMW-PE）/high-density polyethylene （HDPE） as-spun blend filaments were prepared by melt spinning method, and the blend fibers were obtained by drawing at different temperatures. The structure and the mechanical properties of the blend fibers drawn at different hot-drawing temperatures were analyzed by the means of wide-angle X-ray diffraction （ WAXD）, differential scanning calorimetry （DSC） , and tensile test. The crystallinity and the crystal orientation degree were the highest, the grains were the thinnest and the mechanical properties were the highest when the fibers were drawn at 85 ℃. The molecular chains and the crystal structure could not be effectively drawn in lower hot-drawing temperatures. The crystalline melted in a higher drawing temperature, and it was not conductive to the process of the crystal structure reorganization. Therefore, mechanical properties of the blend fibers that hot drawn in lower or higher temperatures were weaker.

关 键 词：超高分子量聚乙烯 高密度聚乙烯 共混 熔融纺丝 晶体结构 拉伸温度 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]