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Abstract

Preparation of polyvinylidene fluoride (PVDF) asymmetric hollow fiber membranes was studied by introducing small
molecular additives, which include nonsolvents (water, ethanol and 1-propanol) and inorganic salt (LiCl). Dimethylacetamide
(DMAC) was used as a solvent. Water was used as an external coagulant, while water, ethanol or a mixture of water and
ethanol was used as an internal coagulant. The prepared PVDF hollow fiber membranes were characterized in terms of water
flux, and molecular weight cut-off for the wet membranes. Average pore size and effective surface porosity were determined
using the gas permeation method for the dried membranes. The cross-sectional structure of the hollow fibers was examined
by scanning electron microscopy. The collapsing pressure and wetting pressure of the dried membranes were also tested. The
effect of polymer concentration, non-solvents, the mixture of non-solvent and LiCl, interna

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