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Block copolymer modified novolac epoxy resin

journal contribution
posted on 2003-09-01, 00:00 authored by Qipeng Guo, J M Dean, R B Grubbs, F S Bates
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.

History

Journal

Journal of polymer science part B: polymer physics

Volume

41

Issue

17

Pagination

1994 - 2003

Publisher

John Wiley & Sons

Location

Chichester, Eng.

ISSN

0887-6266

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2003, Wiley Periodicals

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