Substituent effects on the chain-transfer behavior of 7-methylene-2-methyl-1,5-dithiacyclooctane in the presence of disulfides and thiols

Simon Harrisson, Thomas P. Davis, Richard A. Evans, Ezio Rizzardo

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16 Citations (Scopus)

Abstract

The chain-transfer behavior of 7-methylene-2-methyl-1,5-dithiacyclooctane was investigated in the presence of four chain-transfer agents: thiophenol (PhSH), thiobenzoic acid (BzSH), diphenyl disulfide (PhSSPh), and dibenzoyl disulfide (BzSSBz). The chain-transfer constants for these compounds at 60°C were 0.38 (PhSH), 0.76 (BzSH), 0.24 (PhSSPh), and 0.05 (BzSSBz). The variations in the thiol chain-transfer constants could be explained in terms of the stability of the resulting radicals. The chain transfer to the disulfides, however, appeared to be determined by the electronic character of the disulfide bond, and this suggests that the transfer took place via an addition-fragmentation mechanism.

Original languageEnglish
Pages (from-to)4421-4425
Number of pages5
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume40
Issue number24
DOIs
Publication statusPublished - 15 Dec 2002
Externally publishedYes

Keywords

  • Kinetics (polym.)
  • Polysulfides
  • Ring-opening polymerization

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