In the case of polymeric membranes the nature of the membrane material determines the final gas permeability and selectivity properties, whereas, at the same time, the structural characteristics, such as membrane thickness, density, presence or absence of porosity etc., strongly influence those ...
Many reports provide porosity data; where porosities are not given (or cannot be estimated from density data) our analysis of the WVP data has been limited. A few publications provide sorption isotherm data (see for example [42,49]). Data on specific surface area are rare. Statistical analys...