Abstract
The relations between the chemical and physical properties of a series of bisphenol‐A‐diglycidyl ether epoxy samples prepared by curing with polyetherdiamine of different chain length are reported. Glass transition temperature (Tg) decreased with the decrease in cross link density. The free volume hole sizes measured through positron annihilation lifetime spectroscopy increased with the increase in the chain length of curing agent or with decrease in cross link density. The water uptake by the polymer is influenced by free volumes, the chemical nature and the segmental relaxation in between the molecular chains.
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