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Abstract
The helium and carbon dioxide permeability through film samples of polyamidoimides (PAI) of two series at room temperature and a partial pressure drop of 0.1 MPa across the membrane has been studied. A correlation between the chemical structure of the studied PAI and their permeability has been ascertained: the helium permeability through PAI samples grows with increasing content of the diamine fragment, which reduces the chain stiffness; the selectivity of the studied PAI-based membrane samples for the He/CO 2 gas pair declines as the carbon dioxide permeability increases and the diamine fragment of PAI becomes more complex.
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