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首页> 外文期刊>Journal of Applied Polymer Science >MORPHOLOGY OF GEL-SPUN POLYETHYLENE FIBERS
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MORPHOLOGY OF GEL-SPUN POLYETHYLENE FIBERS

机译：凝胶纺聚乙烯纤维的形态

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Nitric acid etching studies have been conducted on samples of commercially available highly oriented gel-spun polyethylene fibers: Spectra(TM) 900 and 1000 from AlliedSignal Inc. The results show that the acid attacks the fiber, increases crystallinity as observed by X-ray diffraction, increases the enthalpy of melting of unconstrained fibers by 13-25%, and removes topological constrains thus facilitating the crystallization of chain segments in the noncrystalline regions. The acid functionalizes the fiber, creating various oxygen and nitrogen-containing moieties, specifically (C=O)-, -C=C-, and -NO2 groups. The small weight loss upon etching, less than 2%, and the fact that fibers weaken but do not fragment suggests that the gel-spun and -drawn morphology is more resistant to acid attack than are other morphologies of polyethylene. Photomicroscopy shows that acid etching opens cracks normal to the fiber axis. That the acid can attack the gel-spun fibers indicates the presence of structural imperfections such as folds, molecular kinks, or uncrystallized regions within the fibers. Infrared analysis on virgin fibers shows the absence of absorption bands normally associated with the presence of chains lying within amorphous regions in polyethylene. These and other morphological features are integrated into a description of the structure of commercial gel-spun polyethylene fibers. (C) 1995 John Wiley and Sons, Inc. [References: 37]
机译：硝酸蚀刻研究已经在商业上可获得的高度取向的凝胶纺聚乙烯纤维的样品上进行了：AlliedSignal Inc.的Spectra 900和1000。结果表明，酸侵蚀纤维，增加了结晶度，如X射线衍射观察到的，将不受约束的纤维的熔化焓提高了13-25％，并去除了拓扑约束，从而促进了非晶体区域链段的结晶。酸使纤维官能化，产生各种含氧和氮的部分，特别是（C = O）-，-C = C-和-NO2基团。蚀刻后的重量损失很小，不到2％，纤维弱化但不会破碎，这一事实表明，与聚乙烯的其他形态相比，凝胶纺丝和拉伸形态更耐酸侵蚀。光学显微镜显示，酸蚀会打开垂直于纤维轴的裂纹。酸会侵蚀凝胶纺丝纤维，表明存在结构缺陷，例如纤维内的褶皱，分子扭结或未结晶区域。对原始纤维进行的红外分析表明，没有吸收带，通常与聚乙烯无定形区内链的存在有关。这些和其他形态特征被整合到对商业胶纺聚乙烯纤维结构的描述中。 （C）1995 John Wiley and Sons，Inc. [参考：37]

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