A probe on the failure mechanism in rubber-modified epoxy blends: Morphological and acoustic emission analysis

Raju Thomas, F. Ronkay, T. Czigany, Uroš Cvelbac, Miran Mozetic, Sabu Thomas

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In this work, diglycidyl ether of bisphenol A based epoxy resin (DGEBA) was modified with varying amounts of two liquid rubbers: carboxyl terminated copolymer of butadiene and acrylonitrile (CTBN); and a hydroxyl terminated polybutadiene (HTPB), using an anhydride hardener. The ultimate aim of this study was to investigate the failure mechanism operating in the rubber-modified epoxies and to evaluate this by correlating these results with the miscibility and interfacial adhesion between the components and the morphology of the cured network. Some of the mechanical and fracture properties, which are associated with the two-phase particulate morphology, were investigated. The visoelastic behavior of modified epoxies was also analyzed and variations in the shift of T g values in toughened epoxies were explained. The samples were carefully analyzed by an acoustic emission technique to investigate the failure mechanism operating in them. From the response of force and number of acoustic events as well as from the amplitude of acoustic events, we were able to explain the failure mechanisms in the elastomer incorporated epoxy resins supplemented by morphological evidence.

Original languageEnglish
Pages (from-to)1747-1765
Number of pages19
JournalJournal of Adhesion Science and Technology
Volume25
Issue number14
DOIs
Publication statusPublished - Aug 30 2011

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Keywords

  • Epoxy resin/liquid rubber
  • interfacial adhesion and acoustic emission studies
  • mechanical properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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