Effect of lewis acids on reactivity ratios for (meth)acrylate/nonpolar alkene copolymerizations

Ying Chen, Ayusman Sen

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The effect of Lewis acids (A1C1 3 and Sc(OTf) 3) on the reactivity ratios for (meth)acrylate/1-hexene and methacrylate/norbornene radical copolymerizations was investigated. The reactivity ratio r 1 for both methyl acrylate and methyl methacrylate decreases in the presence of Lewis acids; 1-alkene reactivity ratio r 2 is close to zero. The substantial decrease in r 1 values and an increased polymerization rate demonstrate that Lewis acids promote (meth)acrylate cross-propagation significantly more than self-propagation, especially for methyl acrylate. The alkenes do not undergo self-propagation under our conditions. Furthermore, due to (a) enhanced binding of the Lewis acid to the carbonyl group on the monomer compared to those on the polymer and (b) the facile exchange of the Lewis acid between the monomer and the polymer, only a catalytic amount to Lewis acid is required to strongly influence alkene uptake and copolymerization rate.

Original languageEnglish (US)
Pages (from-to)3951-3957
Number of pages7
JournalMacromolecules
Volume42
Issue number12
DOIs
StatePublished - Jun 23 2009

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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