Abstract
This study investigates the fiber structure of a newly developed poly-p-pyridylenebenzobisoxazole fiber. The molecular structure resembles that of poly-p-phenylenebenzobisoxazole fiber, which has a rigid-rod backbone structure with a thin-planar shape; thus, a similar preferential radial orientation of the molecular planes normal to the fiber axis is expected. We have focused on the change of fiber structures induced by copolymerizing hydrophilic groups in a rigid-rod backbone of PBO. The preferential orientation of the crystal planes in various positions of the fiber, the molecular orientation along the fiber axis and the crystal size were analyzed by micro-focus X-ray diffraction. The difference in molecular orientation and crystal size in the various positions was related to the formation of the crystal structure induced by radial preferential orientation of the (200) crystal plane sourced from the rigid-rod backbone structure with the thin-planar shape.
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Acknowledgements
The present authors express their sincere gratitude to Professor K. Tashiro of Toyota Technological Institute for his valuable comments and advice. Thanks are also extended to Dr. H. Masunaga at Japan Synchrotron Radiation Research Institute for his guidance and help in the micro-focus X-ray diffraction measurements and to Mr. K. Funaki for operating the micro-focus X-ray diffraction equipment and data processing. Part of this study was performed as a research program at SPring-8 under the identification number 2016A7212.
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Kitagawa, T., Taniguchi, N. & Abe, Y. Effects of hydrophilicity of rigid-rod polymers on the formation of poly-p-pyridylenebenzobisoxazole fibers. J Mater Sci 52, 4142–4154 (2017). https://doi.org/10.1007/s10853-016-0727-5
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DOI: https://doi.org/10.1007/s10853-016-0727-5