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Structure characterization of melt drawn polyethylene ultrathin films

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分类：O484[理学—固体物理;理学—物理]
作者机构：[1]State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
相关基金：Acknowledgements This work was supported by the National Natural Science Foundation of China （Grant Nos. 20425414, 20374056, 20304018, 50521302 and 20423003）, and the 973 Programs from M0ST of China.
相关项目：高分子材料多层次结构及结构调控

关键词：超薄PE薄膜, 定向, 红外线光谱学, 电子显微术, ultrathin PE film, orientation, infrared spectroscopy,electron microscopy

中文摘要：

高度面向的 uitrathin 聚乙烯(PE ) 电影被 amelt 绘画技术准备。获得的 uitrathin 电影上的传播电子显微镜学学习显示画 PE 薄电影的 melt 由对绘画方向垂直的排列的高度面向的边在最前薄片组成。电子衍射证实在水晶的阶段的 PE 链在沿着 draw/ing 方向的电影飞机是高度面向的，当仅仅结晶的一轴和 b 轴的随机的取向能通过电子衍射被描述时。融化绘画 uitrathin PE 电影上的红外结果证明 PE 分子的链在水晶并且画薄电影的 melt 的无定形相沿着绘画方向是很好面向的。而且， IR 结果在水晶的阶段显示那，结晶的 b 轴，在无定形相趋于在薄电影飞机躺着，一些本地链的骨骼飞机喜欢电影飞机而不是平行。在 uitrathin 电影的 b 轴 ofPE 晶体的排列从 b 轴是 PE 晶体的最快的生长方向的事实发源。

英文摘要：

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.