Journal of Materials Science

, Volume 32, Issue 11, pp 2855–2871 | Cite as

The lateral deformation of cross-linkable PPXTA fibres

  • M. C. G Jones
  • E Lara-Curzio
  • A Kopper
  • D. C Martin
Article

Abstract

The lateral deformation properties of oriented polymer fibres were examined by transverse compressive and torsional experiments. A modified interfacial test system machine was used to study the transverse compressive deformation behaviour of thermally cross-linkable poly(p-1,2-dihydrocyclobutaphenylene terephthalamide) (PPXTA) fibres and of a number of commercially available polymers (Nomex, nylon, Kevlar, Dacron) and ceramic (Nicalon and FP) fibres. The torsional (shear) modulus G of PPXTA and Kevlar poly(p-phenylene terephthalamide) (PPTA) fibres was measured by pendulum experiments. During both fibre torsion and transverse compression, the deformation involves materials slip on (h k 0) planes, in the [0 0 1] direction for the torsion and the [h k 0] directions for transverse compression. The intermolecular crosslinks in PPXTA did not significantly modify the elastic transverse modulus Et and caused only slight (13%) increase in shear modulus G. However, the plastic transverse properties of cross-linked PPXTA were significantly different than those of uncross-linked PPXTA. The stress at the proportional limit σp, determined from the transverse load–displacement curves, was substantially higher for the cross-linked fibres than for the uncross-linked fibres. In addition, the cross-linked PPXTA fibres exhibited a large strain recoverable response reminiscent of elastomers, whereas the PPTA and uncross-linked PPXTA fibres exhibited a large strain irreversible response.

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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • M. C. G Jones
    • 1
  • E Lara-Curzio
    • 2
  • A Kopper
    • 2
  • D. C Martin
    • 1
  1. 1.Department of Materials Science and Engineering and the Macromolecular Science and Engineering CenterThe University of MichiganAnn ArborUSA
  2. 2.High Temperature Materials LaboratoryOak RidgeUSA

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