Block copolymer modified novolac epoxy resin

Qipeng Guo, Jennifer M. Dean, Robert B. Grubbs, Frank S. Bates

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

The phase behavior of uncured and cured mixtures containing stoichiometric amounts of Epon164 novolac epoxy resin and 4,4′-methylenedianiline combined with a nearly symmetric poly(methyl acrylate-co-glycidyl methacrylate-o-polyisoprene) diblock copolymer was investigated with small-angle X-ray scattering and transmission electron microscopy. A series of morphologies were documented as a function of the copolymer concentration, which ranged from pure diblock to 2.5 wt % in the thermoset resin. Ordered lamellae bordered a wide multiphase region followed by disordered wormlike micelles that transformed continuously into vesicles at the lowest compositions. The thermal curing of this pentafunctional epoxy system to complete conversion had little impact on the phase behavior of the mixtures, and this was consistent with previous experiments with difunctional epoxy and the same hardening agent. However, changing the epoxy component led to gross changes in the phase behavior that were interpreted with the concept of a wet-to-dry brush transition.

Original languageEnglish (US)
Pages (from-to)1994-2003
Number of pages10
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume41
Issue number17
DOIs
StatePublished - Sep 1 2003

Keywords

  • Block copolymers
  • Morphology
  • Thermosets

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