Polymerization kinetics of ethylene oxide methacrylates in ionic media

Sara Pedrón, Julio Guzmán, Nuria García

Research output: Contribution to journalArticlepeer-review


The radical polymerization of ethylene oxide (PEGylated) methacrylates in ionic media has been studied. Lithium salts interact with the monomer causing a significant increase in the propagation rate constant, kp, and also providing an ionic and highly viscous medium that sharply decreases the termination rate coefficient, kt. Both features make the polymerization reactions with lithium salts faster compared to the bulk monomer. The systems are studied by means of FT-IR spectroscopy to identify the interactions between the monomer and the lithium salt. In addition, an extensive kinetic study by PLP-SEC has been performed to study the influence of the lithium salt on kp and kt in the polymerization of these monomers. These results are compared to those obtained when ionic liquids are used as polymerization medium. A polymerization system in which kp is enhanced and kt is considerably decreased is presented. The system is based on the use of ionic salts bearing lithium cations. FT-IR studies demonstrate that Li+ cations interact with the monomer molecules. The association ratio (α) to the carbonyl group is responsible for the observed increase in the propagation rate constants, kp, which have been determined by PLP experiments under different reaction conditions.

Original languageEnglish (US)
Pages (from-to)860-869
Number of pages10
JournalMacromolecular Chemistry and Physics
Issue number8
StatePublished - Apr 15 2011


  • PEGylated methacrylates
  • kinetics (polym.)
  • propagation rate constant
  • pulsed-laser polymerization (PLP)
  • radical polymerization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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