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Termination kinetics of free-radical polymerization in ionic liquids

✍ Scribed by Johannes Barth; Michael Buback; Gudrun Schmidt-Naake; Inga Woecht

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
287 KB
Volume
50
Category
Article
ISSN
0032-3861

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✦ Synopsis

Termination rate coefficients, k t , for free-radical polymerization of 15 vol.-% methyl methacrylate (MMA) dissolved in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide and in 1-butyl-3-methylimidazolium tetrafluoroborate were measured at 10 C via the single pulse Γ€ pulsed laser polymerization Γ€ electron paramagnetic resonance (SP-PLP-EPR) technique. Whereas absolute k t in ionic liquid solution is by about one order of magnitude below the associated bulk MMA value, the chain-length dependence of k t is very similar in both liquid environments.

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## Abstract Literature data are summarized for the chain‐length‐dependence of the termination rate coefficient in dilute solution free‐radical polymerizations. In essence such experiments have yielded two parameter values: the rate coefficient for termination between monomeric free radicals, __k__,