Gas permeability

Cross-linked urethane/urea membranes with two soft segments, polypropylene oxide and more hydrophobic polybutadiene, were prepared by extending a polypropylene oxide-based tri-isocyanate-terminated prepolymer (PU) with polybutadiene diol (PBDO). The membranes obtained were analysed with relation to

It can be expected that a microwave acts as an accelerator of the mobility of polar functional groups such as hydroxyl groups in polymeric membranes, and then gas permeability improves because of the increasing free volume and/or temperature of the membranes. The permeability coefficients of CO2 for

Structure-properties relationships in terms of gas transport have been established for a large series of sulfonated copolyimides. The permeability and diffusion coefficients of different gases (H2, O2, CO2, N2) differing by their size and interaction capacity towards the polymers have been determine