Issue 2, 2006

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

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 13 500 plates m−1 were observed (for iodate). The separation of seven inorganic anions was also demonstrated using a hydroxide gradient.

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

Article information

Article type
Paper
Submitted
09 ส.ค. 2548
Accepted
26 ต.ค. 2548
First published
21 พ.ย. 2548

Analyst, 2006,131, 215-221

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

J. P. Hutchinson, E. F. Hilder, R. A. Shellie, J. A. Smith and P. R. Haddad, Analyst, 2006, 131, 215 DOI: 10.1039/B511398A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements