Journal of Materials Science

, Volume 29, Issue 9, pp 2481–2486 | Cite as

Toughened-hybrid epoxies: influence of the rubber-phase morphology on mechanical properties

  • C. I. Vallo
  • Lijiang Hu
  • P. M. Frontini
  • R. J. J. Williams


A toughened-epoxy polymer based on diglycidylether of bisphenol A (DGEBA) cured with ethylenediamine (EDA) and modified with a rubber based on an epoxy-terminated acrylonitrile-butadiene random copolymer (ETBN), exhibited different morphologies depending on the rubber content. Up to 10% rubber, the morphology consisted of a random dispersion of spherical domains rich in rubber, while at 15% rubber, large and irregular domains were present, turning into a co-continuous structure at 20% rubber. Mechanical properties (elastic modulus, uniaxial compression yield stress, critical stress intensity factor, KIC and strain energy release rate, GIC) of the toughened epoxies and hybrid-particulate materials containing glass beads, were analysed. The best mechanical properties were exhibited by hybrids with a random dispersion of rubbery domains in the epoxy matrix. The presence of large and irregular domains or co-continuous structures led to materials with poor mechanical properties.


Epoxy Rubber Stress Intensity Factor Energy Release Rate Uniaxial Compression 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • C. I. Vallo
    • 1
  • Lijiang Hu
    • 1
  • P. M. Frontini
    • 1
  • R. J. J. Williams
    • 1
  1. 1.Institute of Materials Science and Technology (INTEMA)University of Mar del Plata and National Research Council (CONICET)Mar del PlataArgentina

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