熔纺UHMWPE纤维结构和力学性能初探

Structure and mechanical properties of melt-spun UHMWPE fiber

采用超高相对分子质量聚乙烯(UHMWPE)切片进行熔融纺丝,拉伸倍数为22～25,对制得的熔纺UHMWPE纤维的力学性能进行测试,用扫描电镜(SEM)和X射线衍射(XRD)仪对熔纺及凝胶纺UHMWPE纤维的表面形貌和结晶性进行了表征。结果表明:熔纺UHMWPE纤维的断裂强度为17.02 cN/dtex;相比凝胶纺纤维,熔纺纤维线密度大,纵向沟壑多;熔纺UHMWPE纤维结晶度为64.76%,比凝胶纺纤维的稍低,但其取向因子为0.993,大于凝胶纺纤维的。

Ultrahigh-relative molecular mass polyethylene （UHMWPE） chip was produced into fibers at the draw rato of 22 - 25 via melt spinning process. The mechanical properties of melt-spun UHMWPE fibers were measured. The surface morphology and crystallinity of melt-spun and gel-spun UHMWPE fibers were characterized by scanning electron microscopy （SEM） and X- ray diffraction （XRD）. The results showed that the melt-spun UHMWPE fiber had the breaking strength of 17.02 cN/dtex; as compared with gel-spun fiber, melt-spun UHMWPE fiber had higher linear density and more longitudinal grooves; the crystallini- ty of melt-spun UHMWPE fiber was 64.76%, slightly lower than that of gel-spun fiber; the orientation degree of melt-spun UH- MWPE fiber was 0. 993,higher than that of gel-spun fiber.