Kinetics and mechanism of controlled free-radical polymerization of styrene and n-butyl acrylate in the presence of an acyclic β-phosphonylated nitroxide

Didier Benoit, Sandra Grimaldi, Sophie Robin, Jean Pierre Finet, Paul Tordo, Yves Gnanou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

423 Scopus citations

Abstract

This study investigates the kinetics of free radical polymerization of styrene and n-butyl acrylate carried out in the presence of N-tert-butyl-N- [1-diethylphosphono-(2,2-dimethyipropyl)] nitroxide (DEPN). With this stable radical as chain growth moderator, it is demonstrated that the polymerization of these two monomers exhibits a controlled character. The mechanism of polymerization is essentially the same as that described for other 'living'/ controlled radical polymerizations: the chains form a large pool of dormant species that can be reversibly activated, and only a minute fraction of them propagate at a given time. Using dilatometry and electron spin resonance (ESR), the evolution of the concentration of polymeric radicals and that of DEPN could be measured as a function of time. It appears that these DEPN- mediated polymerizations are driven toward a pseudo-stationary state that is reached after an initial period of a few minutes. During this pseudo- stationary phase, the concentration of polymeric radicals and that of DEPN remainded essentially constant, which allowed us to determine the (K) equilibrium constant between dormant and active species and also the rate constants of reversible activation (k(d)) and deactivation (k(rec)) for each monomer. For purposes of comparison, a series of polymerizations were simulated using the PREDICI package: both experimental and simulated data were found to fall in rather good agreement.

Original languageEnglish (US)
Pages (from-to)5929-5939
Number of pages11
JournalJournal of the American Chemical Society
Volume122
Issue number25
DOIs
StatePublished - Jun 28 2000

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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