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Calorimetric Studies of Drawn Polyethylene Terephthalate

  • J. L. Koenig
  • M. D. Mele
Conference paper

Abstract

Dynamic differential calorimetry and density measurements have been made on drawn polyethylene terephthalate. The crystallinity and heats of fusion depend on the type of molecular rearrangements produced by the extent of draw and the temperature of draw. At low temperatures (near the glass transition) the molecules relieve strain by uncoiling with little sliding or alignment occurring. At temperatures above 100°C the molecules glide past one another to relieve strain with little uncoiling. Strain - induced crystals are formed in the samples drawn more than 160% at temperatures near the glass transition; at high strain, both chain alignment and uncoiling occur and produce crystallization at these temperatures. At higher temperatures and high strain, the uncoiling is too small to allow crystallization. Annealing a drawn sample under strain resulted in an increase in uncoiling which is proportional to the strain.

Keywords

Trans Isomer Draw Ratio Calorimetric Study Cold Crystallization Draw Direction 
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References

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    Peterlin, A., and G. Meinel, J. Applied Physics, 36, 3028 (1965).CrossRefGoogle Scholar
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    Koenig, J. L., and S. W. Cornell, “Characterization of Uniaxially Drawn Polyethylene Terephthalate by Polarized Infrared Spectroscopy”, Case Institute of Technology, Technical Report Number 42 (1967).Google Scholar
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    Yeh, G. S. Y., and P. H. Geil, “Crystallization of Polyethylene Terephthalate from the Glassy, ‘Amorphous’ State”, Case Institute of Technology, Technical Report Number 44 (1967).Google Scholar
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    Brandrup, J., and E. H. Immergut (Ed.), Polymer Handbook, Interscience (1966).Google Scholar
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    Mandelkern, L., Crystallization of Polymers, McGraw-Hill, N.Y. (1964).Google Scholar

Copyright information

© Plenum Press 1968

Authors and Affiliations

  • J. L. Koenig
    • 1
  • M. D. Mele
    • 1
  1. 1.Division of Polymer ScienceCase Western Reserve UniversityClevelandUSA

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