Abstract
The stress-strain behaviour and morphological features of PBT films before and after heat treatment are reported. PBT films possess extraordinary mechanical properties comparable to those of the fibres. A non-uniform residual stress distribution is proposed to account for the elastic-plastic behaviour of as-extruded films and the subsequent extensive fibrillization during tensile testing or tension heat treatment. Tension heat treatment results in significant axial modulus and tensile strength increase by improving overall sample orientation and lateral crystallite size with concomitant straightening of buckled regions in the film.
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References
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Feldman, L., Farris, R.J. & Thomas, E.L. Mechanical properties of as-extruded and heat-treated poly-(p-phenylene benzobisthiazole) films. J Mater Sci 20, 2719–2726 (1985). https://doi.org/10.1007/BF00553033
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DOI: https://doi.org/10.1007/BF00553033