Control of methyl methacrylate radical polymerization via Enhanced Spin Capturing Polymerization (ESCP)

Lin Zang, Edgar H.H. Wong, Christopher Barner-Kowollik, Thomas Junkers

Research output: Contribution to journalArticleResearchpeer-review

21 Citations (Scopus)

Abstract

The nitrone mediated polymerization of methyl methacrylate (MMA) via the enhanced (termination) spin capturing polymerization (ESCP) process is made possible via the addition of small amounts of styrene (between 5 and 10 vol.%) to the reaction mixture. Efficient control over the molecular weight between 7000 and 57,000 g mol-1 (at 60 °C) yields macromolecules that feature a mid-chain alkoxyamine functionality and are rich in methyl methacrylate. The collated kinetic and molecular weight data allow for a deduction of the spin capturing constant, CSC, in the range between 0.15 and 0.30. During the ESCP process, the number average molecular weight, Mn, of the formed mid-chain functional polymer is constant up to high monomer to polymer conversions (i.e. 80%). The high degree of alkoxyamine mid-chain functionality present in the generated polymeric material is evidenced via a subsequent nitroxide-mediated polymerization process employing the formed ESCP polymer, indicating a chain extension from 37,700 to 118,000 g mol-1 with a concomitant reduction in polydispersity (from 2.3 to 1.5).

Original languageEnglish
Pages (from-to)3821-3825
Number of pages5
JournalPolymer
Volume51
Issue number17
DOIs
Publication statusPublished - 1 Aug 2010
Externally publishedYes

Keywords

  • Enhanced (termination) spin capturing polymerization (ESCP)
  • Methyl methacrylate (MMA)
  • Nitrone/nitroxide

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