Contruction of "Crystalline" Heat Resistant Plastic Optical Fiber and Their Transparent Film with Excellent Light Conductivity

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应用这种晶体光纤，由于必须减少晶体/非晶态界面处的光折射，因此对固态结构的精确控制是必不可少的。在本研究中，研究了拉伸聚四氟乙烯-共（全氟乙烯乙烯醚）[（简称：聚四氟乙烯醚）]（简称：聚四氟乙烯醚）后精细结构和片层排列的变化。采用广角x射线衍射（WAXD）和小角x射线散射（SAXS）方法对EFA透明晶体光纤进行了研究。EFA在纤维中结晶为片层晶体，并形成较厚的片层（厚度至少为27nm）。这种聚合物可能形成“配电盘型”薄片。在绘制EFA纤维后，照片中出现了四点SAXS图，这意味着形成了一种特殊类型的层结构，一种交替倾斜的片层排列，称为人字形。此外，先前提出的一般含氟聚合物的填充模式需要在倒易晶格中从准六边形修改为正交晶格，以便分配所有反射指数。

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 27nm). 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 known as the herringbone, was formed. Moreover, the previously proposed packing mode of general fluorinated polymers was required to be modified from quasi-hexagonal to orthorhombic in a reciprocal lattice in order to assign all reflective indexes.