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A study on the achievement of high-modulus polyethylene fibres by drawing

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Abstract

Several methods of preparing spherulitic sheets of high-density polyethylene from which high draw ratios (∼ 30x) and high moduli (∼ 800 kbar) may be obtained are described. It is shown that, independent of the method of preparation of the initial sheet, and provided certain conditions are met, the modulus is a unique function of draw ratio. The maximum draw ratio (and hence modulus) achievable from a particular sheet is shown to depend on its morphology and its molecular weight distribution; in particular, the presence of some segregated low molecular weight material appears to be essential. When viewed in the polarizing microscope a “black” region often is observed bounding the spherulites, particularly in those sheets which give high draw ratios. This region is correlated with segregated low molecular weight material. In addition, the recovery properties of high modulus fibres are reported, both after isothermal strain and on annealing when near complete recovery is observed.

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Authors and Affiliations

  1. H.H. Wills Physics Laboratory, University of Bristol, Royal Fort, Tyndall Avenue, Bristol, UK

    P. J. Barham & A. Keller

Authors
  1. P. J. Barham
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  2. A. Keller
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Barham, P.J., Keller, A. A study on the achievement of high-modulus polyethylene fibres by drawing. J Mater Sci 11, 27–35 (1976). https://doi.org/10.1007/BF00541071

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  • DOI: https://doi.org/10.1007/BF00541071

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