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Effects of distortional components in biaxial stretching of poly (ethylene terephthalate) sheets on dimensional stability and structure

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Abstract

Thin sheets of poly (ethylene terephthalate) were stretched biaxially over a wide range to temperatures below the melting point of the polymer. The linear shrinkage occurring at temperatures between 85 and 100 °C decreased with increasing draw temperature and draw ratio. Specimens taken near the edges of the drawn sheets, which had been subjected to in-plane shear deformations, were found to exhibit linear shrinkage 5–8 times lower than those taken from the middle of the sheet. Subsequent experiments, using purpose-built clamps to achieve a more uniform state of shear in both directions of the biaxially drawn samples, confirmed the universality of the principle of shrinkage suppression by the superposition of shear deformations. X-ray diffraction studies revealed that the phenomenon was not related to differences in type of orientation of the crystals. The information from the X-ray diffraction studies and data from thermal analysis have led to the conclusion that the enhanced dimensional stability of biaxially drawn sheets subjected to superimposed shear deformations results from a combination of a higher rate of stress-induced crystallization and a reduction in the level of orientation within the amorphous phase.

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Authors and Affiliations

  1. Institute of Polymer Technology and Materials Engineering, Loughborough University of Technology, LE11 3TU, Loughborough, Leics, UK

    L. Mascia & Z. Fekkai

  2. Dipartimento di Chimica, Universita' di Napoli - Federico II, Via Mezzocannone 4, I-80134, Naples, Italy

    G. Guerra, L. Parravicini & F. Auriemma

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  1. L. Mascia
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  2. Z. Fekkai
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  3. G. Guerra
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  4. L. Parravicini
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  5. F. Auriemma
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Mascia, L., Fekkai, Z., Guerra, G. et al. Effects of distortional components in biaxial stretching of poly (ethylene terephthalate) sheets on dimensional stability and structure. JOURNAL OF MATERIALS SCIENCE 29, 3151–3160 (1994). https://doi.org/10.1007/BF00356656

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