Investigation of the formation of strongly acid cation exchange resins based on slightly cross-linked copolymers
| Autor: | G. Schwachula, R. Hauptmann, I. Kain |
|---|---|
| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Journal of Polymer Science: Polymer Symposia. 47:103-109 |
| ISSN: | 1936-0959 0360-8905 |
| DOI: | 10.1002/polc.5070470114 |
| Popis: | Our investigations of the cation exchange resins based on styrene-divinylbenzene (DVB) have shown that because of its unfavorable reactivity towards styrene, the DVB causes great inhomogeneities in the copolymers formed with styrene. This affects, in a negative way, the mechanical stability of the strongly acid cation exchange resin produced. On the other hand, strongly acid cation exchange resins based on polystyrene may be produced by reacting polystyrene in two steps with chlorosulfonic acid in the presence of formaldehyde. Furthermore, it has been successfully tied to chloromethylate polystyrene in the presence of paraformaldehyde or methylal so that a cross-linked chloromethylated product was formed. It has been the aim of our investigations to make sure if, on the one hand, on the basis of polystyrene, it was possible by chloromethylation to get a cross-linked product that could be subsequently worked into a strongly acid cation exchange resin or, on the other hand, to verify if one could, based on polystyrene in the presence of a formaldehyde-releasing substance, sulfonate in one step so that the product is cross-linked at the same time. The quality criterion of all experiments is to guarantee that the characteristics of the final product, i.e., a strongly acid cation exchange resin, are comparable to those of the well-known resin types based on styrene-DVB. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|