Conclusions
By use of low-angle and large-angle x-ray scattering methods on specimens of technical polyethylene terephthalate yarn, it has been shown that:
heat-treatment with additional stretching makes it possible to preserve both the size and the original orientation level of the ordered structural regions of the polymer, with a significant reduction in size and some reduction in orientation of the amorphous sections;
on heat-treatment with an assigned relaxation, the decrease in size of the amorphous sections and the degree of their disorientation are proportional to the assigned “negative stretch”;
if heat-treatment is conducted under isometric conditions, the size of the amorphous sections changes only slightly, but the mean orientation function remains unchanged.
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Additional information
Translated from Khimicheskie Volokna, No. 2, pp. 24–27, March–April, 1987.
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Pakshver, S.L., Vysotskaya, Z.P. & Aizenshtein, É.M. Change in polymer supermolecular structure on heat-treatment of technical purpose polyester yarns. Fibre Chem 19, 107–111 (1987). https://doi.org/10.1007/BF00552605
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DOI: https://doi.org/10.1007/BF00552605