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A negative water time lag, ranging from -11 to -20 min depending on the draw solution concentration, is observed in the AL-DS orientation. Still, in the AL-FS orientation, the water flux is practically constant from the experiment's onset, leading to a negligible water time lag (1 min). The new method demonstrated in this paper can be a potent tool for characterizing osmotic membranes.The efficient preparation of hydrophilic polypropylene membranes has always been a problem. Here, a twin-screw extruder was used to melt-blend ethylene-vinyl alcohol copol
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