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Porosity of PU membranes were determined by the mass loss of wet membrane after drying [28]. After being wetted thoroughly by pure ethanol, the membranes were weighted under wet status. They were then dried in vacuum until a constant mass was obtained. The porosity (¦Å), i.e., the ratio of pore volume to geometrical volume for membranes was calculated by the following equation, where mw, md, ¦Ñ, A, and L are the weight of wet membrane sample, the weight of dry membrane sample, the pure ethanol density, the sample area and the sample thickness, respectively:
¦Å = (mw ¨C md) / (¦ÑAL) ¡Á 100
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