Sulphonated cross-linked polystyrene: A monofunctional cation-exchange resin

Autor:	K. W. Pepper
Rok vydání:	2007
Předmět:	Aqueous solution Divinylbenzene Styrene chemistry.chemical_compound chemistry Chemical engineering Polymer chemistry medicine Copolymer Particle size Polystyrene Swelling medicine.symptom Ion-exchange resin
Zdroj:	Journal of Applied Chemistry. 1:124-132
ISSN:	1934-998X 0021-8871
DOI:	10.1002/jctb.5010010307
Popis:	Recent improvements in the performance of ion-exchange resins are illustrated by an account of the preparation and properties of sulphonated cross-linked polystyrene. The copolymerization of styrene and divinylbenzene (DVB) in bead form is described. Cross-linked polystyrene has been sulphonated by heating the copolymer with concentrated sulphuric acid at 100°c. in the presence of silver sulphate. After a time depending on the particle size and DVB content of the copolymer, the exchange-capacity of the product attains a limiting value which corresponds to the formation of a monosulphonic acid. Sulphonated cross-linked polystyrene is a hygroscopic gel; its swelling and shrinkage in water and aqueous solutions are markedly dependent on the degree of cross-linking. The cation-exchange properties of the resin are consistent with those expected of a monofunctional, strongly acidic material. The influence of the extent of cross-linking on the relative affinity-coefficients and rates of exchange of sodium and hydrogen ions are indicated.
Databáze:	OpenAIRE
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