Propagation kinetics of free‐radical polymerizations in ionic liquids |
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| Authors: | Inga Woecht Gudrun Schmidt‐Naake Sabine Beuermann Michael Buback Nuria García |
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| Institution: | 1. Institute of Technical Chemistry, Clausthal University of Technology, Erzstra?e 18, D‐38678 Clausthal‐Zellerfeld, Germany;2. Institute of Physical Chemistry, Georg‐August‐Universit?t G?ttingen, Tammannstra?e 6, D‐37077 G?ttingen, Germany;3. Institute of Chemistry, Polymer Chemistry, University of Potsdam, Karl‐Liebknecht‐Stra?e 24‐25, D‐14476 Golm, Germany |
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| Abstract: | Propagation rate coefficients, kp, of methyl methacrylate (MMA) and glycidyl methacrylate (GMA) homopolymerizations were measured at ambient pressure in four ionic liquids (ILs): 1‐ethyl‐3‐methylimidazolium (emim]) ethyl sulfate and emim] hexyl sulfate as well as butyl‐3‐methylimidazolium (bmim]) hexafluorophosphate and bmim] tetrafluoroborate via the pulsed‐laser polymerization size‐exclusion chromatography technique. In passing from bulk polymerization at 40 °C polymerization in IL solution containing 20 vol % monomer, kp is enhanced by up to a factor of 4 with MMA and by a factor of 2 with GMA. This enhancement of kp primarily results from a lowering of activation energy upon partial replacement of monomer by ionic liquid species. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 1460–1469, 2008 |
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| Keywords: | activation energy ionic liquids kinetics (polym ) propagation rate coefficients radical polymerization |
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