Mechanistic study of Sn(Oct)2-catalyzed ε-caprolactone polymerization using Sn(Oct)2/BF3 dual catalyst

G. Jiang, I.A. Jones, C.D. Rudd, G.S. Walker

Research output: Contribution to journalArticle

Abstract

A novel method was used to investigate the mechanism of Sn(Oct)2-catalyzed e-caprolactone polymerization by using Sn(Oct)2/BF3 dual catalyst. The bulk polymerization was conducted at 110 and 130°C with different Sn(Oct)2/BF3 ratios. The polymerization kinetics was followed using gel permeation chromatography, and the molecular structures of the low-molecular weight polymers were examined using 1H-nuclear magnetic resonance (NMR). A polymerization induction period was observed in polymerizations containing the Sn(Oct)2 catalyst, but it was not observed in the system containing only BF3. After the induction period, BF3 and Sn(Oct)2 initiated the polymerization separately. For Sn(Oct)2 catalyst with no purposely added alcohol, the actual initiation species is a tin hydroxide species formed in situ by the reaction of Sn(Oct)2 and adventitious water. For BF3 catalyst, the active species is the protonic acid formed by the reaction of BF3 with the adventitious water. When mixed, the Sn(Oct)2 reacts with the adventitious water faster than the BF3, preventing the BF3 catalyzing any polymerizations during the induction period.

Original languageEnglish
Pages (from-to)658-662
Number of pages5
JournalJournal of Applied Polymer Science
Volume114
Issue number1
Early online date8 Jun 2009
DOIs
Publication statusPublished - Oct 2009

Fingerprint

Polymerization
Catalysts
Water
Gel permeation chromatography
Tin
caprolactone
2-ethylhexanoic acid tin(II) salt
Molecular structure
Alcohols
Molecular weight
Nuclear magnetic resonance
Polymers
Kinetics
Acids

Keywords

  • boron trifluordie
  • ecaprolactone
  • stannous octoate

Cite this

Jiang, G. ; Jones, I.A. ; Rudd, C.D. ; Walker, G.S. / Mechanistic study of Sn(Oct)2-catalyzed ε-caprolactone polymerization using Sn(Oct)2/BF3 dual catalyst. In: Journal of Applied Polymer Science. 2009 ; Vol. 114, No. 1. pp. 658-662.
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Mechanistic study of Sn(Oct)2-catalyzed ε-caprolactone polymerization using Sn(Oct)2/BF3 dual catalyst. / Jiang, G.; Jones, I.A.; Rudd, C.D.; Walker, G.S.

In: Journal of Applied Polymer Science, Vol. 114, No. 1, 10.2009, p. 658-662.

Research output: Contribution to journalArticle

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