281566 Preparation and Characterization of Porous Poly(vinylidene fluoride) Membranes Using New Pore Forming Additives
Much attention has been paid to semicrystalline poly(vinylidene fluoride) (PVDF) as a membrane material due to its high resistance to harsh environments (including both both acidic and basic conditions), its high thermal and UV stabilities, and its affordable cost at large scale. [1-5]. PVDF membranes can be produced using wet phase inversion. Recently, organic and inorganic pore forming additives have been included in the membrane casting solution; these additives include poly (vinyl pyrrolidone), polyethylene glycol, LiClO4, LiCl, and ZnCl2. Changes in membranes morphology, performance, and mechanical strength due to the use of pore forming agents have been reported in the literature. [6-12].
This paper investigates the effect of new pore forming additives, trimeythelbenzene (TMB) and sodium chloride to the poly(vinylidene fluoride)-N,N-dimethylacetamide system. The use of these additives significantly influenced the final morphology of the membranes. The total porosity and the average pore diameter increased with the addition of TMB and NaCl. Scanning electron microscopy, water intrusion porosimetery, capillary flow porometry, and water contact angle were used to characterize the morphology, porosity, average pore size, liquid entry pressure and hydrophobicity of the membranes.
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