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Kink bands with a thickness ranging from 45 nm to 1.8 μm were observed in polybenzobisoxazole (PBO) fibres examined in the transmission electron microscope. These bands are localized, and oriented at 69° ± 3° with respect to the fibre axial direction. The average shear strain is about 0.7 along the band. Bands of intermediate thicknesses (e.g. 0.1-0.3 μm) are wavy and relatively less uniform than...
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