Fracture toughness of difunctional epoxy resin/thermally latent initiator system modified with polyesters

  • Jin F
  • Park S
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Abstract

Aromatic polyester was used as a modifier to improve the toughness of diglycidylether of bisphenol A (DGEBA)/thermally latent initiator system. N-Benzylquinoxalinium hexafluoroantimonate (BQH) was used as a thermally latent initiator for thermal curing, and the content of polyester was varied from 2.5 to 10 wt%. The thermal latent behaviors, thermal properties, and mechanical interfacial properties of DGEBA/ polyester blends were investigated with several techniques. It was found that the BQH as a latent initiator showed the activity at a comparably narrow temperature range in the present study. The KICof the DGEBA/polyester blends was higher than that of the neat epoxy system and exhibited a maximum value at 5 wt% polyester. The scanning electron microscope (SEM) results showed rough and plastic deformation morphologies in the DGEBA/polyester blends.

Author-supplied keywords

  • Epoxy resins
  • Fracture toughness
  • Polyester
  • Thermal latent initiator
  • Thermal stabilities

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Authors

  • Fan Long Jin

  • Soo Jin Park

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