X-ray diffraction studies on crystalline structure of pan precursors

HAN Shu-peng;XU Liang-hua*;CAO Wei-yu;YAO hong

Journal of Beijing University of Chemical Technology ›› 2005, Vol. 32 ›› Issue (2) : 63-67.

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Journal of Beijing University of Chemical Technology ›› 2005, Vol. 32 ›› Issue (2) : 63-67.
研究论文

X-ray diffraction studies on crystalline structure of pan precursors

  • HAN Shu-peng;XU Liang-hua*;CAO Wei-yu;YAO hong
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Abstract

The transformation law of crystalline structure of polyacrylonitrile precursors in the process of fiber formation was studied by means of X-ray diffraction (XRD), and a new model for polyacrylonitrile precursor was presented. The results show that, in the process of fiber formation, the crystalline structure of polyacrylonitrile precursors are transformed from a two-phase semi-crystalline structure, with distinct semi-crystal (ordered) region and amorphous (disordered) region, into a single-phase para-crystalline structure, which is made by interlacing of the new ordered region transformed from amorphous region and initial semi-crystal region. In the single-phase para-crystalline structure, the polymer molecules are assumed to be a contorted helical shape to form rods (like zigzag), and the rods stack tightly via interactional overlapping, intersecting and intertwisting.

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HAN Shu-peng;XU Liang-hua*;CAO Wei-yu;YAO hong. X-ray diffraction studies on crystalline structure of pan precursors[J]. Journal of Beijing University of Chemical Technology, 2005, 32(2): 63-67

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