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

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posted on 2023-05-16, 18:44 authored by Hutchinson, J, Emily HilderEmily Hilder, Robert ShellieRobert Shellie, Jason SmithJason Smith, Paul HaddadPaul Haddad
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 13 500 plates m-1 were observed (for iodate). The separation of seven inorganic anions was also demonstrated using a hydroxide gradient. © The Royal Society of Chemistry 2006.

History

Publication title

Analyst

Volume

131

Pagination

215-221

ISSN

0003-2654

Department/School

School of Natural Sciences

Publisher

Royal Society of Chemistry

Place of publication

Cambridge, UK

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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