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Gas Permeabilty and Temperature-Dependence Free-Volume Studies in Polyurethane Membranes by Positron Lifetime and Doppler Spectroscopies

Authors: M.F. Ferreira Marques, P.M. Gordo, C. Lopes Gil, A.P. de Lima, D. Placco Queiroz, M. Norberta de Pinho, Zs. Kajcsos, G. Dupl√Ętre

Ref.: Mater. Sci. Forum 445-446 (2004)