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Epoxy polymers are an important class of material for use in variousapplications. Due to their hydrophilic nature, epoxy resins tend to absorbmoisture. Absorption of moisture degrades the functional, structural andmechanical properties. For polymers, it is known that moisture absorption canlead to both reversible and irreversible changes. In this study, the combinedeffect of moisture and elevated temperature on the mechanical properties ofEpon 862 and its nanocomposites were investigated. The extent of permanentdamage on fracture toughness and flexural properties of epoxy, due to theaggressive degradation provided by hygrothermal ageing, was determined bydrying the epoxy and their clay/epoxy nanocomposites after moisture absorption.From the investigation it was found that, hygrothermal ageing has detrimentaleffect on mechanical properties of both neat polymer and clay/polymernanocomposite. Significant permanent damage was observed for fracture toughnessand modulus, while the extent of permanent damage was less significant forflexural strength.

The effect of clay on the mechanical properties of epoxy resins subjected to hygrothermal ageing