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Structure characterization of melt drawn polyethylene ultrathin films

机译：熔体拉伸聚乙烯超薄膜的结构表征

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Highly oriented ultrathin polyethylene (PE) films were prepared by a melt-draw technique. Transmission electron microscopy study on the obtained ultrathin films indicates that the melt drawn PE thin films consist of highly oriented edge-on lamellae aligned perpendicular to the drawing direction. Electron diffraction confirms that the PE chains in crystalline phase are highly oriented in film plane along the drawing direction, while only a random orientation of the crystallographic a- and b-axes can be described through electron diffraction. The IR results on the melt-drawn ultrathin PE films demonstrate that the PE molecular chains in both crystalline and amorphous phases of the melt drawn thin films are well oriented along the drawing direction. Moreover, the IR results indicate that in the crystalline phase, the crystallographic b-axis tend to lie in the thin film plane, while in the amorphous phase, the skeleton plane of some local chains prefers to parallel the film plane. The alignment of b-axis of PE crystals in ultrathin films originates from the fact that the b-axis is the fastest growth direction of the PE crystals.
机译：通过熔体拉伸技术制备高取向的超薄聚乙烯（PE）膜。对获得的超薄膜的透射电子显微镜研究表明，熔融拉伸的PE薄膜由高度取向的边沿薄板组成，该薄板垂直于拉伸方向排列。电子衍射证实，晶相中的PE链沿拉伸方向在膜平面中高度取向，而通过电子衍射只能描述晶体学a轴和b轴的随机取向。熔融拉伸的超薄PE膜的IR结果表明，熔融拉伸薄膜的结晶相和非晶相中的PE分子链均沿拉伸方向很好地定向。此外，IR结果表明，在结晶相中，结晶学b轴倾向于位于薄膜平面内，而在非晶相中，某些局部链的骨架面倾向于平行于膜面。超薄膜中PE晶体的b轴排列是因为b轴是PE晶体最快的生长方向。

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