Abstract
ABSTRACTThe water permeability of a piperazine‐based thin‐film composite membrane was enhanced via roughening its smooth surface by adding a highly organic‐soluble additive to a piperazine‐aqueous solution. The additive could rapidly diffuse into organic solvent drawing piperazine during interfacial polymerization, and consequent, rapid diffusion of piperazine led to an increase in the size and number of ridges on the surface of the prepared membrane. Polyethylene glycol (PEG) was the most effective among the tested additives, and PEG with lower molecular weight exhibited a better effect. Mw 2000 PEG scarcely affected the surface roughness, whereas Mw 200 PEG raised the surface roughness by seven times. As a result, the membranes prepared with Mw 2000 PEG and Mw 200 PEG exhibited 9 and 41% enhanced water permeability compared to the control membrane, respectively, despite their similar hydrophilicity. This difference could be attributed to their different surface roughness. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47913.
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