Thermal- and stress-induced lattice distortions in a single Kevlar49 fibre studied by microfocus X-ray diffraction |
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Authors: | R J Davies M Burghammer |
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Affiliation: | (1) European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble Cedex, France |
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Abstract: | Understanding the macroscopic physical and mechanical properties of poly(p-phenylene terephthalamide) (PpTA) fibres as a function of temperature requires an understanding of how temperature influences
its microscopic structure. This study investigates lattice distortions in single PpTA fibres using the high brilliance of
a synchrotron radiation microbeam. Lattice distortions are studied over a temperature range of 110–350 K and the influence
of tensile deformation is also considered. The results reveal linear thermal expansion behaviour for all unit cell axes, in
general agreement with literature. Expansion/contraction is greatest along the 100] direction whilst being reduced along
010] by inter-chain hydrogen bonding. During macroscopic deformation, longitudinal crystal strain dominates with respect
to axial lattice distortions induced by temperature changes. There is only a small change in the 100] coefficient of thermal
expansion, with the 010] and 001] directions being largely unaffected. |
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