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Abstract: Correlation between transport properties and free volume has been widely evidenced by several authors. We are showing through a positron annihilation study in a high barrier polymer that transport properties can be improved by means of antiplasticizers addition. We also are verifying in this paper the influence of both free volume hole size and free fractional volume in diffusion of gases, finding a relationship with solubility too. [Copyright &y& Elsevier]

Abstract: Modification of transport properties of an amorphous polyamide, poly(trymethylhexamethylene terephtalamide) by addition of a nanosilicate, montmorillonite has been studied. For this proposal, carbon dioxide, water vapor and oxygen have been investigated in different sorption and permeability devices. Transport properties have also been related to the structural features. X-ray diffraction and transmission electron microscopy have provided the morphological analysis as well as the positron annihilation lifetime spectroscopy has given the free volume characterization. [Copyright &y& Elsevier]