Removal of a low molecular weight, crystallizable polymer fraction from solutions of poly[oxy-1,4-phenylenesulphonyl-1,4-phenyleneoxy-1,4-phenylene(1-methylethylidene)-1,4-phenylene] (polysulphone©)

Wijmans, J.G. and Smolders, C.A. (1983) Removal of a low molecular weight, crystallizable polymer fraction from solutions of poly[oxy-1,4-phenylenesulphonyl-1,4-phenyleneoxy-1,4-phenylene(1-methylethylidene)-1,4-phenylene] (polysulphone©). European Polymer Journal, 19 (12). pp. 1143-1146. ISSN 0014-3057

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Abstract:	The oligomer fraction of poly[oxy-1,4-phenylenesulphonyl-1,4-phenyleneoxy-1,4-phenylene(1-methylethylidene)-1,4-phenylene] (Polysulphone©) with molecular weight between 450 and 900 daltons is responsible for the precipitation in concentrated solutions of polysulphone in N,N-dimethylformamide and other solvents. The precipitate is of a crystalline nature and consists mainly of the oligomers. These oligomers differ from the higher molecular weight molecules not only in crystallization properties. In a liquid-liquid phase separated system consisting of polysulphone, N,N-dimethylacetamide and water, the oligomers accumulate exclusively in the polysulphone-poor, dilute phase. The solubility parameter concept is used to illustrate the origin of this difference in behaviour. The removal of the oligomers from the dissolved polysulphone can be achieved by a crystallization process.
Item Type:	Article
Copyright:	Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Membrane Science and Technology (MST)
Link to this item:	http://purl.utwente.nl/publications/67226
Official URL:	http://dx.doi.org/10.1016/0014-3057(83)90010-1
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