Toughness behaviour of vinylester/epoxy thermosets with interpenetrating network structure

J. Karger-Kocsis, Oleg Gryshchuk

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Vinylester/epoxy-based (VE/EP) thermosets of interpenetrating network (IPN) structure were produced by using a VE resin (bismethacryloxy derivative of a bisphenol-A type EP resin) and EP resins of aliphatic (Al-EP) and cycloaliphatic (Cal-EP) nature. Curing of the EP resins occurred either by an aliphatic (Al-Am) or a cycloaliphatic (Cal-Am) diamine compound. Dynamic mechanical thermal analysis (DMTA) and atomic force microscopy (AFM) suggested the presence of an interpenetrating network (IPN) in the resulting thermosets. AFM scans taken on the ion-etched surface of EP showed a featureless homogeneous structure. On the other hand, VE exhibited a two-phase microgel, whereas VE/EP a two-phase interpenetrating network (IPN) structure. Toughness was characterised by parameters of the linear elastic fracture mechanics, viz. fracture toughness (Kc) and fracture energy (Gc). Unexpected high K c and Gc data were found for the systems containing cyclohexylene units in the EP network. This was attributed to beneficial effects of the conformational changes along the cyclohexylene linkages (chair/boat). The failure mode of the VE/EP thermoset combinations was studied by scanning electron microscopy (SEM) and discussed.

Original languageEnglish
Title of host publicationMacromolecular Symposia
Pages317-328
Number of pages12
Volume217
DOIs
Publication statusPublished - Oct 2004

Fingerprint

Interpenetrating polymer networks
Thermosets
Toughness
Resins
Atomic force microscopy
Diamines
Fracture energy
Boats
Fracture mechanics
Thermoanalysis
Failure modes
Curing
Fracture toughness
Ions
Derivatives
Scanning electron microscopy

Keywords

  • Atomic force microscopy (AFM)
  • Epoxy resin
  • Fracture mechanics
  • Interpenetrating network (IPN)
  • Vinylester resin

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

Toughness behaviour of vinylester/epoxy thermosets with interpenetrating network structure. / Karger-Kocsis, J.; Gryshchuk, Oleg.

Macromolecular Symposia. Vol. 217 2004. p. 317-328.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Karger-Kocsis, J. ; Gryshchuk, Oleg. / Toughness behaviour of vinylester/epoxy thermosets with interpenetrating network structure. Macromolecular Symposia. Vol. 217 2004. pp. 317-328
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