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用DSC法研究了超高相对分子质量聚乙烯(UHMWPE)纤维的熔融行为。随着拉伸倍数提高,纤维经松弛状态下热处理后,其熔融峰数目由1个变为2个;而经部分张力和张力状态下热处理后,其熔融峰数目均由1个变为3个。熔融峰出现的位置可分为4个区:131-138℃,141-143℃,150-152℃,155- 157℃。松弛与张力状态下热处理纤维的主熔融峰不同,前者主要是正交晶系的熔融,后者则分别对应于正交晶相向六方晶相的转变和六方晶相的熔融。经热处理的UHMWPE纤维的DSC图谱表明,代表正交晶相向六方晶相转化的熔融峰面积均有所增大,同时纤维的拉伸强度均有提高,提高幅度达31.1%。
The melting behavior of ultrahigh molecular weight polyethylene (UHMWPE) fibers was studied by DSC. With the increase of draw ratio, the number of melting peaks changed from 1 to 2 after the heat treatment in the relaxed state, and the number of melting peaks changed from 1 to 3 after heat treatment under partial tension and tension . Melting peak appearing in the location can be divided into four zones: 131-138 ℃, 141-143 ℃, 150-152 ℃, 155-157 ℃. The main melting peaks of heat-treated fibers in relaxation and tension state are different, the former are mainly orthorhombic melts and the latter correspond respectively to the transformation of orthorhombic to hexagonal phases and the melting of hexagonal phases. DSC spectra of the heat-treated UHMWPE fibers show that the melting peak area representing the transformation from the orthorhombic to the hexagonal phase both increases, and the tensile strength of the fibers increases by as much as 31.1%.