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Journal of Materials Science

, Volume 29, Issue 12, pp 3151–3160 | Cite as

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

  • L. Mascia
  • Z. Fekkai
  • G. Guerra
  • L. Parravicini
  • F. Auriemma
Article

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.

Keywords

Crystallization Shrinkage Thermal Analysis Amorphous Phase Shear Deformation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • L. Mascia
    • 1
  • Z. Fekkai
    • 1
  • G. Guerra
    • 2
  • L. Parravicini
    • 2
  • F. Auriemma
    • 2
  1. 1.Institute of Polymer Technology and Materials EngineeringLoughborough University of TechnologyLoughboroughUK
  2. 2.Dipartimento di ChimicaUniversita' di Napoli - Federico IINaplesItaly

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