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- W2028088714 abstract "The free-volume parameters in various urethane/urea membranes obtained by varying the ratio of the structural constituents, polypropylene oxide and polybutadiene, were studied by positron lifetime and Doppler broadening measurements. On bi-soft segment membranes, a correlation was found between the composition of membranes, the normalized free volume, the radii of the holes and gas permeability. However, the correlation is not clear when PU data are also considered, indicating that other features must also play an important role in the permeation mechanism." @default.
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- W2028088714 date "2003-10-01" @default.
- W2028088714 modified "2023-09-26" @default.
- W2028088714 title "Free-volume studies in polyurethane membranes by positron annihilation spectroscopy" @default.
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- W2028088714 doi "https://doi.org/10.1016/s0969-806x(03)00234-2" @default.
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