Elsevier

Desalination

Volume 186, Issues 1–3, 30 December 2005, Pages 39-46
Desalination

Relationship between type of nonsolvent additive and properties of polyethersulfone membranes

https://doi.org/10.1016/j.desal.2005.01.017Get rights and content

Abstract

Flat-sheet membranes were obtained by immersion precipitation from a polyethersulfone–dimethylacetamide–nonsolvent additive–water system. The effects of propionic acid, propionic acid anhydride, butyric acid and butyric acid anhydride, as an additive in a polymer solution, in relation to the phase separation process and membrane structure and properties were investigated. According to scanning electron microscopy analyses, it was found that a nonsolvent additive has a significant influence on structure of the membrane skin layer and the sublayer.

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    Citation Excerpt :

    Wienk et al. [12] investigated the effect of PVP as additive to PES spinning solution and reported that the morphology of fabricated membrane is influenced by the rheological properties and phase behavior of the polymer solution. The effects of PEG molecular weight and blending PVP on the structure of PES hollow fiber membrane were investigated elsewhere [13] which increasing the molecular weight of PEG changed the structure of membrane from a double layer fingerlike to a structure with spherical and ellipsoidal shape voids [14]. Phase separation behavior of PEI/solvent/nonsolvent additive was investigated elsewhere [15] where nine nonsolvent additives were studied.

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