Structural and morphological studies of isotactic polypropylene fibers during heat/draw deformation by in-situ synchrotron SAXS/WAXD
Structural and morphological studies of isotactic polypropylene fibers during heat/draw deformation by in-situ synchrotron SAXS/WAXD
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DOI：
10.1021/ma0016477
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发表时间：
2001-03
期刊：
影响因子：
5.5
通讯作者：
S. Ran;Xinhua Zong;D. Fang;B. Hsiao;B. Chu;R. Phillips
中科院分区：
文献类型：
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作者：
S. Ran;Xinhua Zong;D. Fang;B. Hsiao;B. Chu;R. Phillips
采用同步小角x射线散射（SAXS）和广角x射线衍射（WAXD）技术对等规聚丙烯（iPP）纤维在加热和拉伸过程中的结构和形态变化进行了在线研究。采用独特的图像分析方法将二维（2D） WAXD模式反卷积成晶体，亚晶和非晶相的定量分数。结果表明：初始iPP纤维中α-型晶体存在较大缺陷，经室温拉伸后转变为亚晶改性；相应的二维SAXS图显示，iPP纤维的中间阶段没有明显的长周期（即无片层结构）。我们假设iPP纤维中间相的成分包括具有随机螺旋手的定向螺旋链束和可能没有螺旋结构的定向链；两者都只有部分包装订单。中间相的形成是通过…
On-line studies of structural and morphological changes during the heating and drawing process of isotactic polypropylene (iPP) fiber were carried out using synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) techniques. A unique image analysis method was used to deconvolute the two-dimensional (2D) WAXD patterns into quantitative fractions of crystal, mesomorphic, and amorphous phases. Results showed that the α-form crystals were quite defective in the initial iPP fibers and were converted into the mesomorphic modification by drawing at room temperature. Corresponding 2D SAXS patterns showed that there was no obvious long period (i.e., no lamellar structure) in the mesophase of the iPP fiber. We postulate that the constituents of the mesophase in iPP fibers include oriented bundles of helical chains with random helical hands and perhaps oriented chains with no helical structures; both have only partial packing ordering. The formation of the mesophase is through the des...