Solution homopolymerizations of n-butyl acrylate and styrene mediated using 2,2,5-trimethyl-4-tert-butyl-3-azahexane-3-oxyl (TITNO)

Neil R. Cameron, Olivier Lagrille, Peter A. Lovell, Bencha Thongnuanchan

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

Use of Styryl-TITNO (the styrene alkoxyamine of 2,2,5-trimethyl-4-tert- butyl-3-azahexane-3-oxyl) as mediator for nitroxide-mediated polymerization (NMP) of n-butyl acrylate (BA) and styrene has been investigated at temperatures ≤110 ºC. Very good control of molecular weight and molecular weight dispersity with no measurable loss of active chains, and no evidence of tails in the molecular weight distribution as conversion increases, was observed at 90 ºC for BA and at 70 ºC for styrene. The alkoxyamine dissociation equilibrium constant values determined for polyBA-TITNO (8.5 × 10-11 mol L-1 at 90 ºC) and polystyrene-TITNO (3.1 × 10-9 mol L-1 at 70 C) are consistent with those required for control when using more established nitroxides that require higher temperatures to achieve these values. The lower optimum polymerization temperatures with Styryl-TITNO as mediator provide new opportunities for NMP and are especially significant for styrene since this appears to eliminate completely the complications from thermal initiation.

Original languageEnglish
Pages (from-to)772-781
Number of pages10
JournalPolymer
Volume55
Issue number3
DOIs
Publication statusPublished - 12 Feb 2014
Externally publishedYes

Keywords

  • Alkoxyamine dissociation
  • Kinetics
  • Nitroxide-mediated polymerization

Cite this

Cameron, Neil R. ; Lagrille, Olivier ; Lovell, Peter A. ; Thongnuanchan, Bencha. / Solution homopolymerizations of n-butyl acrylate and styrene mediated using 2,2,5-trimethyl-4-tert-butyl-3-azahexane-3-oxyl (TITNO). In: Polymer. 2014 ; Vol. 55, No. 3. pp. 772-781.
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abstract = "Use of Styryl-TITNO (the styrene alkoxyamine of 2,2,5-trimethyl-4-tert- butyl-3-azahexane-3-oxyl) as mediator for nitroxide-mediated polymerization (NMP) of n-butyl acrylate (BA) and styrene has been investigated at temperatures ≤110 ºC. Very good control of molecular weight and molecular weight dispersity with no measurable loss of active chains, and no evidence of tails in the molecular weight distribution as conversion increases, was observed at 90 ºC for BA and at 70 ºC for styrene. The alkoxyamine dissociation equilibrium constant values determined for polyBA-TITNO (8.5 × 10-11 mol L-1 at 90 ºC) and polystyrene-TITNO (3.1 × 10-9 mol L-1 at 70 C) are consistent with those required for control when using more established nitroxides that require higher temperatures to achieve these values. The lower optimum polymerization temperatures with Styryl-TITNO as mediator provide new opportunities for NMP and are especially significant for styrene since this appears to eliminate completely the complications from thermal initiation.",
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Solution homopolymerizations of n-butyl acrylate and styrene mediated using 2,2,5-trimethyl-4-tert-butyl-3-azahexane-3-oxyl (TITNO). / Cameron, Neil R.; Lagrille, Olivier; Lovell, Peter A.; Thongnuanchan, Bencha.

In: Polymer, Vol. 55, No. 3, 12.02.2014, p. 772-781.

Research output: Contribution to journalArticleResearchpeer-review

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