%0 journal article
%@ 0376-7388
%A Budd, P.M.,Msayib, K.J.,Tattershall, C.E.,Ghanem, B.S.,Reynolds, K.J.,McKeown, N.B.,Fritsch, D.

%D 2005
%J Journal of Membrane Science
%N 1-2
%P 263-269 
%R doi:10.1016/j.memsci.2005.01.009
%T Gas separation membranes from polymers of intrinsic microporosity
%U https://doi.org/10.1016/j.memsci.2005.01.009
1-2 
%X When polymeric membranes are employed to remove selectively one component from a gaseous mixture, there is generally a trade-off between selectivity and permeability. Data are presented for two polymers of intrinsic,microporosity, PIM-1 and PIM-7, which show a significant advance across the previous upper bound of performance for commercially important gas pairs including O2/N2 and CO2/CH4. The exceptional properties of PIMs arise from,their rigid but contorted molecular structures, which frustrate packing and so create free volume, coupled with chemical functionality giving strong intermolecular interactions.