Relationships among the 129 Xe NMR chemical shift, Xe sorption properties and density in the miscible tetramethyl bisphenol A polycarbonate (TMPC)/polystyrene (PS) polymer blend system were investigated to estimate the variation of microvoids resulting from blending. The Xe sorption properties of the TMPC/PS blend system indicated that blending reduced the amount of microvoids. The 129 Xe NMR chemical shift of the 129 Xe in the blend showed a nonlinear low-field shift with an increasing amount of total Xe sorbed for all the sample films. The estimation of microvoids in this polymer blend system using 129 Xe NMR spectroscopy has been coincident with the variation in the density and Xe sorption properties.
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