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Positron annihilation lifetime spectroscopy (PALS) was used to measure the free volume cavity sizes and free volume fractions of bisphenol A and polyglycol diepoxide crosslinked epoxy coatings on steel before and after saturation with liquid water at 23 °C. The effect of water saturation on the coatings' free volume was studied under the assumptions: (i) the free volume is the major pathway by which...