In-Situ Simultaneous Synchrotron Small- and Wide-Angle X-ray Scattering Measurement of Poly(vinylidene fluoride) Fibers under Deformation
In-Situ Simultaneous Synchrotron Small- and Wide-Angle X-ray Scattering Measurement of Poly(vinylidene fluoride) Fibers under Deformation
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DOI：
10.1021/ma990896w
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发表时间：
2000-02
期刊：
影响因子：
5.5
通讯作者：
Jing Wu;J. Schultz;F. Yeh;B. Hsiao;B. Chu
中科院分区：
文献类型：
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作者：
Jing Wu;J. Schultz;F. Yeh;B. Hsiao;B. Chu
在室温下对以不同卷绕速度（10.6 - 61.0 m/min）纺制的聚偏氟乙烯（PVDF）纤维进行拉伸-保持变形，并进行原位同步小角和广角X射线散射测量。详细分析了α晶向β晶的转变以及片层和纤维状结构的形态变化。发现所有纤维在变形的早期阶段屈服，导致沿纤维沿着交替的颈缩和非颈缩区域。从二维（2-D）广角X射线衍射（WAXD）图案，混合的α和β（次要部分）形式被发现共存于未拉伸纤维。变形有助于从α-型转变为β-型。在颈缩区，α-β相变比非颈缩区多。在颈缩之前，α型的整体结晶度指数和晶胞参数没有显著变化。从二维小角X射线散射（SAXS）图案，两种赤道...
Poly(vinylidene fluoride) (PVDF) fibers spun at different take-up speeds (10.6−61.0 m/min) were subjected to stretch−hold deformation at room temperature and in-situ simultaneous synchrotron small- and wide-angle X-ray scattering measurements. Crystal transformation from α to β form and morphological changes in lamellar and fibrillar structures were analyzed in detail. All fibers were found to yield at an early stage of deformation, resulting in alternating necked and unnecked regions along the fiber. From the two-dimensional (2-D) wide-angle X-ray diffraction (WAXD) patterns, mixed α and β (minor fraction) forms were found to coexist in the undrawn fibers. Deformation assisted in the conversion from the α-form into the β-form. In necked regions, more α to β transformation took place than in unnecked regions. The overall crystallinity index and unit cell parameters of the α form did not change significantly prior to necking. From the 2-D small-angle X-ray scattering (SAXS) patterns, two kinds of equatoria...