Fabrication study of polysulfone hollow-fiber microfiltration membranes: Optimal dope viscosity for nucleation and growth

Dope viscosity increased sharply as PEG Mw was raised to 20,000 or higher, as did water permeate flux. SEM image analysis revealed that outer-surface pore size increased with PEG Mw. Morphology of the inner surface transformed markedly as PEG Mw was raised from 6000 to 20,000.