熔纺UHMWPE纤维在拉伸过程中的结构与力学性能  

Structure and Tensile Properties of Melt Spun UHMWPE Fibers in Drawing Process

作　　者：张强[1] 王庆昭[2] 陈勇[2] 

机构地区：[1]山东科技大学材料科学与工程学院 [2]山东科技大学化学与环境工程学院应用化学系,山东青岛266590

出　　处：《高分子材料科学与工程》2014年第3期80-84,共5页Polymer Materials Science & Engineering

基　　金：山东省科技发展计划(2012G0020222)

摘　　要：采用高流动性的超高分子量聚乙烯(UHMWPE)树脂颗粒,以熔融纺丝法制备出了拉伸强度为1.6GPa的UHMWPE纤维。利用热分析(DSC)、广角X射线衍射(WAXD)、小角X射线散射(SAXS)、拉伸试验研究了UHMWPE纤维在拉伸过程中结构和力学性能的变化。研究显示,随着拉伸倍数的增加,UHMWPE纤维的结晶度增加,晶粒尺寸下降,纤维的缺陷度逐渐下降,取向度逐渐增大,拉伸强度逐渐增加;其结构和力学性能变化规律与凝胶法相似;有效拉伸倍率低可能是导致熔纺UHMWPE纤维的拉伸性能不如凝胶纺丝纤维的主要原因。Ultra high molecular weight polyethylene （UHMWPE） fibers with the tensile strength of 1.5GPa were successfully prepared by melt-spinning process. The structure and tensile properties were studied by XRD, DSC, SAXS and mechanical measurements . The results show that with the increase of draw ratio, the crystallinity of UHMWPE fibers increases, the grain size decreases, the defects decrease, the orientation degree increases and the tensile properties increase; the changes of structures and tensile properties of UHMWPE fibers made by melt-spun are similar with that of the fibers made by gel-spun drawing process. The low effective draw ratio may be the key of restrictions in the improvement of the tensile properties of UHMWPE fibers.

关 键 词：超高分子量聚乙烯 纤维 熔融纺丝 结构 力学性能 

分 类 号：TQ342.61[化学工程—化纤工业]