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Journal of Materials Science

, Volume 31, Issue 10, pp 2687–2692 | Cite as

Mechanical properties of thermosets

Part I Tensile properties of an anhydride cured epoxy
  • A. Tcharkhtchi
  • S. Faivre
  • L. E. Roy
  • J. P. Trotignon
  • J. Verdu
Papers

Abstract

The tensile properties of a DGEBA (diglycidylether of bisphenol A)-norbornene anhydride network (Tg≈130±5 °C), were studied in the range (220 K-Tg); 4×10−4 to 14×10−3S−1. The viscoelastic spectrum (1 Hz) reveals a low β transition at 220 K. The bulk modulus is practically constant between 200 K andTg — 20 K. The Poisson's ratio increases very slowly untilTg — 30 K. Then it increases rapidly to reach its asymptotic value (0.5) near toTg. The tensile (E) and shear (G) moduli display the classical behaviour linked to viscoelasticity. Plastic yielding occurs atT ≥ 80 °C, the elongation at yield is almost temperature and strain rate independent (G3y = 0.035), whereas the yield stress obeys Kambour's relationship: σy = 1.1 (TgT) and Eyring's law (activation volume = 914cm3mol−1). Physical ageing at 120 °C strongly affects the yield stress and the ductility. The maximum draw ratio, obtained atTTg, is ΛRC = 1.35, which seems to be consistent with the network's crosslink density.

Keywords

Polymer Mechanical Property Ductility Anhydride Tensile Property 
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 1996

Authors and Affiliations

  • A. Tcharkhtchi
    • 1
  • S. Faivre
    • 1
  • L. E. Roy
    • 1
  • J. P. Trotignon
    • 1
  • J. Verdu
    • 1
  1. 1.ENSAMParisFrance

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