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The gas permeation behaviour of a number of polyimide copolymers, including a series of copolyimides of identical structure with different molecular weights, have been investigated. Permeabilities and selectivities were found to vary over a broad molecular weight range at high molecular weights. Differences in permeability with molecular weight can be comparable to differences due to marked changes in chemical structure.

Посилання на статтю:

Molecular weight dependence of gas permeability and selectivity in copolyimides / G. C. Eastrnond*, P. C. B. Page and J. Paprotny // Polymer. – 1993. – Vol 34. – P. 667-670.

Molecular weight dependence of gas permeability and selectivity in copolyimides - Завантажити.