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对由准稀溶液速冷凝胶化结晶方法制备的超高分子量聚乙烯(UHMWPE)膜,应用广角及小角X射线衍射进行了研究,证明所形成的膜是片晶-分子链折叠的层积状结构。片晶折叠链的分子链方向(即C轴方向)垂直于膜面,在片晶间无规排列的分子链平行膜面,具有较强的“排列”取向,片晶-无规排列链形成的大点阵间距为109(?),片晶间的无规排列链沿垂直分子链方向的统计平均间距约为4.6(?),分子链数约为4～5。这一结果在超拉伸过程中,有利于从片晶-折叠分子链到完全伸直链的转变,从而可获得超高拉伸比(λ>200)。
The ultra-high molecular weight polyethylene (UHMWPE) films prepared by the rapid cooling gel method of quasi-dilute solution were studied by wide-angle and small-angle X-ray diffraction. The results show that the films formed are lamellar Like structure. The direction of the molecular chain (ie, C-axis direction) of the sheet-folded chains is perpendicular to the film surface, and the molecular chain parallel film surfaces randomly arranged between the sheetlets have a strong “alignment” orientation, and the sheet-random alignment chains form (?). The statistical average spacing of randomly arranged chains along the vertical molecular chains is about 4.6 (?), And the number of molecular chains is about 4 ~ 5. This result facilitates the transition from a lamellar-folded molecular chain to a fully stretched chain during the ultra-stretching process, resulting in an ultra-high draw ratio (λ> 200).