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An investigation into the relationship between processing, structure and properties for high-modulus PBO fibres: part 3: analysis of fibre microstructure using transmission electron microscopy

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Abstract

A detailed morphological study of the microstructure of poly(p-phenylene benzobisoxazole) (PBO) fibres (HM and HM+) and a polypyridobisimidazole (PIPD) (HT) fibre has been undertaken using transmission electron microscopy. Both PBO and PIPD fibres are composed of rigid-rod polymers having p-phenylene rings in the molecular backbone and show high modulus (280–360 GPa) and high strength (4–6 GPa). It is found that the PBO HM+ fibre has the highest degree of molecular orientation of the three fibres and the longest crystal length along the fibre axis, while the PIPD fibre shows a lower degree of orientation and a shorter crystal length than the PBO fibres. To understand the effect of crystalline size and fine structure of the fibres upon mechanical properties, dark-field and high-resolution lattice images were obtained and analysed in detail.

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Acknowledgements

The authors would like to express their gratitude to Toyobo Co. Ltd and EPSRC for financial support and to Toyobo for allowing publication. The supply of the PIPD (M5) HT fibres from Akzo Co., Ltd is also acknowledged. One of the authors (TK) also extends his thanks to Peter Kenway, Ian Brough (School of Materials), Hiroki Murase and Yusuke Shimizu (Research Centre, Toyobo) for their help, suggestions and discussions on the TEM technique and analysis. He would also like to dedicate this publication to celebrate the 70th Anniversary of the Society of Fibre Science and Technology, Japan.

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Authors and Affiliations

  1. Research Centre, Toyobo Co. Ltd., Katata, Ohtsu City, Shiga, 520-0292, Japan

    Tooru Kitagawa & Kazuyuki Yabuki

  2. Advanced Materials Research Laboratory, Glyndŵr University, Wrexham, LL11 2AW, UK

    Andrew C. Wright

  3. School of Materials, University of Manchester, Manchester, M13 9PL, UK

    Robert. J. Young

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  1. Tooru Kitagawa
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  2. Kazuyuki Yabuki
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  3. Andrew C. Wright
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  4. Robert. J. Young
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Correspondence to Robert. J. Young.

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Kitagawa, T., Yabuki, K., Wright, A.C. et al. An investigation into the relationship between processing, structure and properties for high-modulus PBO fibres: part 3: analysis of fibre microstructure using transmission electron microscopy. J Mater Sci 49, 6467–6474 (2014). https://doi.org/10.1007/s10853-014-8377-y

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  • DOI: https://doi.org/10.1007/s10853-014-8377-y

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