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Membrane formation by nonsolvent induced phase inversion was directly observed using light microscopy. Polysulfone (PSf) was used as a model polymer while 1-methyl-2-pyrrolidinone (NMP), N,N-dimethylformamide (DMF), water and glycerol were used as model solvents and nonsolvents. Direct observation and kinetic analyses suggest finger-like macrovoids formed by convective flow of nonsolvent into the...
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