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Confirmation of the healing mechanism in a mendable EMAA-epoxy resin

journal contribution
posted on 01.03.2012, 00:00 authored by S Meure, Russell VarleyRussell Varley, D Y Wu, S Mayo, K Nairn, S Furman
The healing of a mendable epoxy resin containing polyethylene-co-methacrylic acid (EMAA) particles has been confirmed to occur via a pressure delivery mechanism of the healing agent, EMAA, into a crack plane during thermal activation. Internal pressure rises within a bubble, formed from interactions between EMAA particles causing expansion of
the bubble which subsequently force the healing agent to flow into an available cavity. The use of X-ray ultra-microscopy (Xum), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) provides evidence for volatile formation, bubble expansion and delivery of healing agent. Spectroscopic studies of the interfacial reactions between
epoxy and EMAA during post-cure, compared with adhesion and fracture toughness measurements, reveal that hydroxyl acid reactions catalysed via tertiary amine initiate the pressure delivery mechanism. Furthermore, adhesion and FTIR measurements suggest that the re-binding or healing of a crack interface is likely to be dominated by hydrogen bonding.

History

Journal

European Polymer Journal

Volume

48

Issue

3

Pagination

524 - 531

Publisher

Pergamon Press

Location

United Kingdom

ISSN

0014-3057

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2011, Elsevier