Article ID Journal Published Year Pages File Type
643992 Separation and Purification Technology 2007 5 Pages PDF
Abstract

The gas transport behaviour of the series of structurally different polyurethanes (PU) was studied in detail. The polymers investigated were synthesised from various macrodiols, including hydroxy terminated polyethers, polyesters and polydienes, 2,4-diisocyanate (2,4-TDI) and a low molecular weight diol as a chain extender. The structural variations introduced were manifested by the differences in the Tg and density values of the resulting materials and by their various transport properties. Membranes obtained from PUs with more polar or shorter macrodiol segments, or with an addition of a chain extender were seen to exhibit the lower permeability. The diffusivity and solubility of oxygen and nitrogen in PUs were found to correlate with the glass transition temperature of macrodiol segments. The selectivity results demonstrate that PUs studied are more selective than conventional PUs reported in literature. Unexpectedly, some of the most selective PUs exhibited also the highest permeability.

Related Topics
Physical Sciences and Engineering Chemical Engineering Filtration and Separation
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