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Towards high capacity latex-coated porous polymer monoliths as ion-exchange stationary phases

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Hutchinson, JP and Shellie, RA and Hilder, EF and Smith, JA and Haddad, PR (2006) Towards high capacity latex-coated porous polymer monoliths as ion-exchange stationary phases. Analyst, 131 (2). pp. 215-221. ISSN 0003-2654

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Abstract

The preparation of high capacity agglomerated monolithic ion-exchangers for capillary ion chromatography is described. Post-modification of reactive monoliths was investigated as an alternative to co-polymerisation of a suitable functional monomer with an overarching goal of increasing ion-exchange capacity. Direct sulfonation of poly styrene-co-divinyl benzene monoliths using concentrated sulfuric acid or chlorosulfonic acid was unsuccessful even for monoliths containing as low as 8% crosslinker. In contrast, chemical transformation of reactive monoliths containing glycidyl methacrylate was used to increase the ion-exchange capacity by up to more than thirty-fold with ion exchange capacities of 14–29 µequiv g–1 achieved. Three different reactions were considered, including reaction with 4-hydroxybenenesulfonic acid under basic conditions; reaction with thiobenzoic acid followed by transformation to a reactive thiol and the subsequent oxidation to the sulfonic acid; and direct sulfonation with sodium sulfite. Of these, the reaction with sodium sulfite resulted in the most significant increase in the capacity and the best separation performance. In the isocratic mode separation efficiencies of over 13500 plates m–1 were observed (for iodate). The separation of seven inorganic anions was also demonstrated using a hydroxide gradient.

Item Type: Article
Journal or Publication Title: Analyst
Page Range: pp. 215-221
ISSN: 0003-2654
Identification Number - DOI: 10.1039/b511398a
Date Deposited: 11 Sep 2008 01:56
Last Modified: 18 Nov 2014 03:50
URI: http://eprints.utas.edu.au/id/eprint/7550
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