Structure/Property Relationships of Poly(ethylene terephthalate) Continuous-filament Yarn |
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| Authors: | S K Mukhopadhyay D J Mwaisengela P W Foster |
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| Affiliation: | Department of Textiles , University of Manchester Institute of Science and Technology , Manchester 1, England |
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| Abstract: | Two commercial PET yarns, one as-spun and the other highly crystalline and drawn, were annealed at l8°C under various conditions. Mechanical and thermal-response measurements were made under high transient-heating conditions by using a UMIST-built Universal Fibre Tester (UFT). Differential-scanning-calorimetry (DSC) measurements were also made. A middle endotherm was observed on DSC traces for both the PET samples that had been annealed freely (free to shrink). Further thermo-mechanical treatments of these pre-annealed samples were made and thermal, creep, tangent-modulus, and other mechanical properties are recorded. The experimental results show structural instability in the fibre morphology irrespective of the process histories. |
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