Journal of Materials Science

, Volume 20, Issue 1, pp 182–192 | Cite as

Toughening of polyester resins by rubber modification

Part 1 Mechanical properties
  • G. A. Crosbie
  • M. G. Phillips


The toughening effect of reactive liquid rubber additions on two polyester resin systems has been investigated. Fracture toughness and crack propagation behaviour have been studied, using the double torsion test. Toughness, as defined by fracture surface energy for crack initiation, increased with rubber content. The magnitude of the increase was dependent upon rubber-resin compatibility. The most successful system, incorporating an experimental butadiene-acrylonitrile rubber, showed an eight-fold increase in toughness, compared with the unmodified resin. Other proprietary systems showed more modest increases. Modulus and heat distortion temperature were also investigated for the different rubber-resin systems. In all cases, some deterioration in these properties was seen. The experimental rubber caused a reduction in resin modulus comparable with that produced by proprietary rubbers; heat distortion temperature in the experimental system was relatively little affected. The experimental rubber also affected the stress-strain behaviour of the resin. Resin modified with the experimental rubber yielded and deformed plastically, in contrast with the unmodified material, which behaved in a brittle manner.


Fracture Toughness Crack Initiation Polyester Resin Torsion Test Rubber Content 
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Copyright information

© Chapman and Hall Ltd. 1985

Authors and Affiliations

  • G. A. Crosbie
    • 1
  • M. G. Phillips
    • 1
  1. 1.School of Materials ScienceThe University of BathClaverton Down, BathUK

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