Table of Contents Author Guidelines Submit a Manuscript
International Journal of Polymer Science
Volume 2010 (2010), Article ID 684051, 9 pages
http://dx.doi.org/10.1155/2010/684051
Research Article

Synthesis and Properties of Anion Exchangers Derived from Chloromethyl Styrene Codivinylbenzene and Their Use in Water Treatment

1Hydrogeochemistry Department, Desert Research Center, Mataria, Cairo 11753, Egypt
2Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA
3School of Chemical Engineering, Oklahoma State University, Stillwater, OK 74078, USA

Received 8 January 2010; Accepted 5 May 2010

Academic Editor: Marek Cypryk

Copyright © 2010 Hesham A. Ezzeldin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Amination of vinylbenzyl chloride-divinylbenzene (VBC-DVB) copolymers is an effective method for preparation of ion-exchange resins. Conventionally, the starting polymer is produced by chloromethylation of a styrene-divinylbenzene copolymer that utilizes chloromethyl methyl ether, a known carcinogen. An alterative approach is to copolymerize vinylbenzyl chloride with divinylbenzene to generate the necessary VBC-DVB. This method provides precise control over the density of the ion-exchange groups. The regiochemistry of the vinylbenzyl chloride methods was realized using solvent-ion exchange groups. In this investigation, an improved solvent system was found for the preparation of anion exchange resins by the vinylbenzyl chloride route. The effectiveness of amination of the intermediate VBC-DVB polymers with a variety of trimethylamine reagents was investigated, and ethanolic trimethylamine produced the highest degree of amination. These resulting ion-exchange polymers were characterized by a variety of techniques such as analytical titrations, nitrogen analysis, Fourier transform infrared spectroscopy and thermal gravimetric analysis. Testing of these copolymers for breakthrough was performed. The results indicate that these anion exchangers have a meaningful increase in thermal stability over commercial anionic exchange beads.