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首页> 外文期刊>Journal of Applied Polymer Science >In situ small angle X-ray scattering study on structural evolution of crosslinked polytetrafluoroethylene during deformation
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In situ small angle X-ray scattering study on structural evolution of crosslinked polytetrafluoroethylene during deformation

机译：交联聚四氟乙烯变形过程中结构演化的原位小角X射线散射研究

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摘要

The structural evolution of virgin and crosslinked polytetrafluoroethylene (PTFE) during stretching was studied by in situ synchrotron small-angle X-ray scattering (SAXS). Both yield and tensile stress of crosslinked PTFE increased with increasing crosslinking density. During stretching, for virgin PTFE, amorphous chains gradually turned to tensile direction at early stage, perpendicularly arranged lamellar stacks appeared at high strains (>140%). While for crosslinked PTFE, lamellar structure was observed even at lower strains; with increasing irradiation dose, the lamellar structure became obvious and the long period decreased. Four-point SAXS patterns were observed only in 3000kGy-dosed PTFE during deformation, which indicated that an alternately tilted lamella arrangement called herringbone structure was formed. Radiation dose induces crosslinked networks formed, which can carry part of local stress during deformation, resulting in the increase of yield and tensile stress. Crosslinking density is an important factor on structural evolution. In addition, a deformation mechanism of different crosslinked PTFE is proposed.
机译：通过原位同步加速器小角X射线散射（SAXS）研究了拉伸过程中原始交联的聚四氟乙烯（PTFE）的结构演变。交联PTFE的屈服强度和拉伸应力均随交联密度的增加而增加。在拉伸过程中，对于原始PTFE，非晶链在早期阶段逐渐转向拉伸方向，在高应变（> 140％）时出现垂直排列的层状堆叠。对于交联的PTFE，即使在较低的应变下也观察到层状结构。随着辐照剂量的增加，层状结构变得明显，且长周期缩短。仅在变形过程中在3000kGy剂量的PTFE中观察到四点SAXS图案，这表明形成了交替倾斜的薄片排列，称为人字形结构。辐射剂量引起形成的交联网络，该网络可以在变形过程中承受部分局部应力，从而导致屈服和拉伸应力的增加。交联密度是影响结构演变的重要因素。另外，提出了不同交联PTFE的变形机理。

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