熔体纺丝和凝胶纺丝UHMWPE纤维结构对比  

Comparison of Structure of UHMWPE Fibers Prepared by the Melt Spun and Gel Spun

作　　者：张强[1] 张军[1] 王庆昭 

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》2017年第9期101-105,111,共6页Polymer Materials Science & Engineering

摘　　要：目前,通过熔体纺丝法制备出的超高分子量聚乙烯(UHMWPE)纤维的拉伸强度不如凝胶纺丝纤维。文中利用热分析仪、广角X射线衍射仪、小角X射线散射仪研究了熔体纺丝和凝胶纺丝UHMWPE纤维的微观结构,通过对比发现,熔纺UHMWPE纤维拉伸强度不如凝胶纺丝纤维的原因在于熔体纺丝UHMWPE纤维的伸直链结晶含量低于凝纺纤维,大分子链没有获得充分的伸直,单斜晶的取向度较低,纤维的整体结构不如凝胶纺丝纤维致密。而造成这一结果的根本原因在于熔纺UHMWPE纤维的有效拉伸倍率不高。At present, the tensile strength of UHMWPE fibers prepared by melt spinning was lower to gel spun fibers. In this paper, the microstructures of the melt spun and gel spun UHMWPE fibers were studied by XRD,DSC and SAXS. The results are shown, compared with UHMWPE fiber produced by gel spun, the melt spun UHMWPE fiber has lower tensile strength primarily because it contains a small volume of extended-chain crystallites. Its macromolecular chains do not stretch fully. Thus, monoclinic crystals inside the UHMWPE fibers produced by melt spinning have a low degree of orientation, and its structure is not as compact as that of fiber produced by gel spun. The fundamental reason for this result is that the effective draw ratio of the melt-spun UHMWPE fiber is not high.

关 键 词：超高分子量聚乙烯纤维 熔体纺丝 凝胶纺丝 结构 

分 类 号：TQ342.61[化学工程—化纤工业]