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01-09-2014 | Issue 18/2014

Journal of Materials Science 18/2014

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

Journal:
Journal of Materials Science > Issue 18/2014
Authors:
Tooru Kitagawa, Kazuyuki Yabuki, Andrew C. Wright, Robert. J. Young

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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