Destruction of epoxy resins and of glass-fibre-reinforced epoxy resins by diffused water

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Abstract
Epoxy resins behave as semi-permeable barriers that allow the passage of water but not the passage of solutes present as impurities and inhomogeneities and, as a consequence of osmosis during exposure to wet environments, pressure pockets are generated both within the resin and at fibre/resin interfaces. Four pressure-filled cavities within the resin, calculation demonstrates that the equilibrium shape is a flat disc-shaped cavity closely resembling the disc-shaped cracks observed experimentally. For solutes located at fibre/resin interfaces, the consequence of pressure generation is creation of interfacial gaps and loss of load transfer ability.
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