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Title: Advantages of block copolymer synthesis by RAFT-controlled dispersion polymerization in supercritical carbon dioxide
Authors: Jennings, James
Beija, Mariana
Kennon, Jeremy T.
Willcock, Helen
O'Reilly, Rachel K.
Rimmer, Stephen
Howdle, Steven M.
Keywords: Polymers
Issue Date: 2013
Publisher: © American Chemical Society
Citation: JENNINGS, J. ... et al., 2013. Advantages of block copolymer synthesis by RAFT-controlled dispersion polymerization in supercritical carbon dioxide. Macromolecules, 46 (17), pp.6843-6851.
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.
Sponsor: [The authors] thank the EPSRC for the PhD studentship (J.J.) and postdoctoral support (M.B.).
Version: Published
DOI: 10.1021/ma401051e
URI: https://dspace.lboro.ac.uk/2134/22857
Publisher Link: http://dx.doi.org/10.1021/ma401051e
ISSN: 0024-9297
Appears in Collections:Published Articles (Materials)

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