Abstract
For the purpose of studying the relation between the stereoregularity and the sorption properties of atactic (a-PMMA) and isotactic (i-PMMA) poly(methyl methacrylate) samples, the isotherms for the sorption of water vapour by these polymers were determined. The glass transition temperatures, T g and the densities of both PMMA samples were also measured under different conditions of moisture content. The amount of water vapour sorbed by i-PMMA was found, in this study, to be greater than that by a-PMMA. This is rather peculiar when we consider that the former has a high crystallinity (76%) and the latter is non-crystalline in nature. It was concluded that water vapour is sorbed by a-PMMA by a mechanism whereby the water molecules sorbed, fill pre-existing sites (polar groups) and spaces occupied by microvoids or free volumes in the polymer without causing any swelling in the latter; and that the extra sorption of water vapour by i-PMMA was due to a mechanism by which the water molecules sorbed cause the polymer to swell, and thus increase its sorption capacity.
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