Phase separation phenomena in solutions of polysulfone in mixtures of a solvent and a nonsolvent: relationship with membrane formation

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Wijmans, J.G. and Kant, J. and Mulder, M.H.V. and Smolders, C.A. (1985) Phase separation phenomena in solutions of polysulfone in mixtures of a solvent and a nonsolvent: relationship with membrane formation. Polymer, 26 (10). pp. 1539-1545. ISSN 0032-3861

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Abstract:The phase separation phenomena in ternary solutions of polysulfone (PSf) in mixtures of a solvent and a nonsolvent (N,N-dimethylacetamide (DMAc) and water, in most cases) are investigated. The liquid-liquid demixing gap is determined and it is shown that its location in the ternary phase diagram is mainly determined by the PSf-nonsolvent interaction parameter. The critical point in the PSf/DMAc/water system lies at a high polymer concentration of about 8% by weight. Calorimetric measurements with very concentrated PSf/DMAc/water solutions (prepared through liquid-liquid demixing, polymer concentration of the polymer-rich phase up to 60%) showed no heat effects in the temperature range of −20°C to 50°C. It is suggested that gelation in PSf systems is completely amorphous. The results are incorporated into a discussion of the formation of polysulfone membranes.
Item Type:Article
Copyright:Elsevier Ltd
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/67231
Official URL:http://dx.doi.org/10.1016/0032-3861(85)90090-4
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