Changes in Arrangement of Lamella and Fine Crystallite in Fluorinated "Crystalline" Transparent Fibers with Drawing
Changes in Arrangement of Lamella and Fine Crystallite in Fluorinated "Crystalline" Transparent Fibers with Drawing
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DOI：
10.1021/ma800801d
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发表时间：
2008-09
期刊：
影响因子：
5.5
通讯作者：
A. Fujimori;Y. Hayasaka
中科院分区：
文献类型：
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作者：
A. Fujimori;Y. Hayasaka
最近，我们开发了一种具有优异耐热性和尺寸稳定性的“结晶”塑料光纤。为了在不久的将来实际使用这种晶体光纤，固态结构的精确控制是必不可少的，因为必须减少晶体/非晶界面处的光折射。采用广角X射线衍射（WAXD）和小角X射线散射（SAXS）方法研究了聚全氟乙基乙烯基醚（EFA）透明结晶纤维在拉伸过程中的精细结构和片层排列的变化。EFA在纤维中结晶为薄片晶体，并形成较厚的薄片（厚度：至少27 nm）。这种聚合物可以形成“开关板型”薄片。在拉伸EFA纤维时，照片中出现了四点SAXS图，这意味着一种特殊类型的层结构，即交替倾斜的层片排列。
Recently, we developed a “crystalline” plastic optical fiber with excellent heat resistance and dimensional stability. For the practical use of this crystalline optical fiber in the near future, an accurate control of the solid-state structure is indispensable because of the necessity of reducing light refraction at the crystalline/amorphous interface. In the present study, changes in the fine structure and lamella arrangement upon drawing poly[tetrafluoroethylene-co-(perfluoroethylvinylether)] (abbrev. EFA) transparent crystalline fibers were investigated by using wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) methods. The EFA was crystallized as a lamella crystal in the fibers and formed a thicker lamella (thickness: at least 27 nm). This polymer might form a “switchboard-type” lamella. Upon the drawing of the EFA fibers, four-point SAXS diagrams developed in the photograph, which implied that a particular type of layer structure, an alternately tilted lamella arrangement kn...