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Advantages of block copolymer synthesis by RAFT-controlled dispersion polymerization in supercritical carbon dioxide
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Jennings, James, Beija, Mariana, Kennon, Jeremy T., Willcock, Helen, O’Reilly, Rachel K., Rimmer, Stephen and Howdle, Steven M. (2013) Advantages of block copolymer synthesis by RAFT-controlled dispersion polymerization in supercritical carbon dioxide. Macromolecules, Volume 46 (Number 17). pp. 6843-6851. doi:10.1021/ma401051e ISSN 0024-9297 .
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Official URL: http://dx.doi.org/10.1021/ma401051e
Abstract
Reversible addition–fragmentation chain transfer (RAFT)-controlled block copolymer synthesis using dispersion polymerization in supercritical carbon dioxide (scCO2) shows unprecedented control over blocking efficiency. For PMMA-b-PBzMA and PMMA-b-PSt the blocking efficiency was quantified by measuring homopolymer contaminants using the techniques of GPC deconvolution, gradient polymer elution chromatography (GPEC), and GPC dual RI/UV detection. A new, promising method was also developed which combined GPC deconvolution and GPEC. All techniques showed that blocking efficiency was significantly improved by reducing the radical concentration and target molecular weight. Estimated values agreed well with (and occasionally exceeded) theory for PMMA-b-PBzMA. The heterogeneous process in scCO2 appeared to cause little or no further hindrance to the block copolymerization procedure when reaction conditions were optimized. High blocking efficiencies were achieved (up to 82%) even at high conversion of MMA (>95%) and high molecular weight. These data compare favorably to numerous published reports of heterogeneous syntheses of block copolymers.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | Macromolecules | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0024-9297 | ||||
Official Date: | 27 August 2013 | ||||
Dates: |
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Volume: | Volume 46 | ||||
Number: | Number 17 | ||||
Page Range: | pp. 6843-6851 | ||||
DOI: | 10.1021/ma401051e | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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