This article is a US Government work, and, as such, is in the public domain in the United States of America.
Methods for removal of residual catalyst from polymers prepared by ring opening metathesis polymerization†
Article first published online: 22 OCT 2010
Copyright © 2010 Wiley Periodicals, Inc.
Journal of Polymer Science Part A: Polymer Chemistry
Volume 48, Issue 24, pages 5752–5757, 15 December 2010
How to Cite
Lambeth, R. H., Pederson, S. J., Baranoski, M. and Rawlett, A. M. (2010), Methods for removal of residual catalyst from polymers prepared by ring opening metathesis polymerization. J. Polym. Sci. A Polym. Chem., 48: 5752–5757. doi: 10.1002/pola.24380
- Issue published online: 16 NOV 2010
- Article first published online: 22 OCT 2010
- Manuscript Accepted: 9 SEP 2010
- Manuscript Received: 24 AUG 2010
- U.S. Department of Energy and USARL
Methods for removing the residual Grubbs' third generation catalyst from polymers prepared by ring opening metathesis polymerization are reported. Two strategies were investigated for reduction of the residual catalyst in the final polymer product. The first strategy involved the use of heterogeneous functionalized particles to scavenge the catalyst from the solution. Filtration of the particles followed by precipitation produced polymers with 10–60 ppm residual catalyst, depending on the type of particle used, surface functional groups, and number of equivalents. The second strategy used small organic molecules that could coordinate to the metal species and modify the solubility of the catalyst, facilitating partitioning of the catalyst into the precipitation solvent. Several types of molecules with varied functionality reduced the residual catalyst level to 30–120 ppm, depending on the loading. Hydrogenation of the polymer backbone followed by precipitation lowered the residual Ru content from 195 ppm to 10 ppm, suggesting that the difficulty of completely removing the catalyst could be a result of coordination of the metal species to the double bonds in the polymer backbone. Reducing the amount of trace catalyst significantly improved the oxidative stability of the polymer. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010