Abstract
Addition of certain low molecular diluents cause glassy polymers to become stiffer owing to reduced rates of segmental motions. This antiplasticization response is accompanied by a decrease in permeability to gases and may be accompanied by either an increase or a decrease in the selectivity of transport for any two gases. When compared to the trade-off between selectivity and productivity of gas separation membranes made from a variety of polymer structures, antiplasticization does not offer any advantageous combination of these traits for either polysulfone or poly(phenylene oxide). However, this approach may have value when increased selectivity at the expense of productivity is justified but developing membranes from another polymer is not desirable.
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