Journal of Materials Science

, Volume 38, Issue 1, pp 133–139 | Cite as

Low temperature crystallographic data on Kevlar 49 fibres

  • R. V. Iyer
  • K. Sooryanarayana
  • T. N. Guru Row
  • K. VijayanEmail author


Using X-ray diffraction data, the behaviour of Kevlar 49 fibres at low temperatures, up to −100°C, has been analysed. During cooling, the basal plane of the monoclinic unit cell shrinks whereas the c- (unique, chain axis) length is not significantly affected. In contrast, in the return heating cycle to ambient temperature, the basal plane expands and contraction occurs along the chain direction. The unit cell registers a reduction in volume in both the cooling and heating cycles. Conspicuously, after a cycle of cooling and heating, the unit cell does not return to its initial volume.


Polymer Ambient Temperature Diffraction Data Crystallographic Data Basal Plane 
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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • R. V. Iyer
    • 1
  • K. Sooryanarayana
    • 2
  • T. N. Guru Row
    • 2
  • K. Vijayan
    • 1
    Email author
  1. 1.Materials Science DivisionNational Aerospace LaboratoriesBangaloreIndia
  2. 2.Solid State and Structural Chemistry UnitIndian Institute of ScienceBangaloreIndia

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