Alkoxyamine-mediated "living" radical polymerization: MS investigation of the early stages of styrene polymerization initiated by cumyl-TEISO

Salvacion P. Cresidio, Fawaz Aldabbagh, W. Ken Busfield, Ian D. Jenkins, San H. Thang, Clovia Zayas-Holdsworth, Per B. Zetterlund

Research output: Contribution to journalArticleResearchpeer-review

30 Citations (Scopus)

Abstract

A new series of 1,1,3,3-tetraethylisoindoline-2-oxyl (TEISO)-based alkoxyamines was prepared. The half-lives for thermal dissociation indicated that the most sterically congested cumyl-TEISO alkoxymine had the greatest potential as an initiator for the polymerization of monomers at lower temperatures. The polymerization of styrene at 110 °C gave a linear evolution of Mn with conversion in the early stages. Further evidence for the "living" nature was given by the polydispersities of the polymers that remained low (Mw/Mn = 1.13-1.27) throughout the polymerization (up to 80% conversion). No polymer was formed for the styrene system in a reasonable time below 100 °C. High-performance liquid chromatographic/mass spectrometric investigations of the distribution of trapped oligomers containing one to nine monomer units formed at 60 °C revealed that the trapping of oligomeric cumyl-styryl radicals by TEISO is irreversible at this temperature. Methyl methacrylate polymerized with cumyl-TEISO at 60-70 °C, although the initial high rates of polymerization soon decreased to zero at low conversions (10-15%), and the high polydispersities (Mw/Mn = 1.42-1.73) indicated significant side reactions.

Original languageEnglish
Pages (from-to)1232-1241
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume39
Issue number8
DOIs
Publication statusPublished - 15 Apr 2001
Externally publishedYes

Keywords

  • Living radical
  • Nitroxide
  • Polymerization
  • Styrene

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