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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Xanthate-mediated copolymerization of vinyl monomers for amphiphilic and double-hydrophilic block copolymers with poly(ethylene glycol)
Macromolecules, Volume 40, No. 25, Year 2007
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Description
Two xanthate end-functional poly(ethylene glycol)s (PEGs) were tested as macromolecular chain-transfer agents (macroCTA) in the reversible addition-fragmentation transfer-mediated polymerization of vinyl acetate (VAc) and N-vinylpyrrolidone. The macroCTA leaving group played a determining role in the preparation of the block copolymers. PEG-b-PVAc and PEG-è-PVP diblock copolymers were obtained when the macroCTA had a propionyl ester leaving group, whereas under the same experimental conditions the macroCTA with a phenylacetyl ester leaving group inhibited the polymerization. In situ 1H NMR spectroscopy polymerizations were performed with low molecular weight xanthate analogues to investigate the cause of inhibition. Block copolymers were prepared with the macroCTA which did not inhibit the polymerization and were characterized via size exclusion chromatography, high-performance liquid chromatography, and matrix-assisted laser desorption ionization time-of-flight mass spectrometry. The ability to produce narrowly distributed (PDI < 1.4) block copolymers end capped with a xanthate moiety with little to no homopolymer contaminant is presented. © 2007 American Chemical Society.
Authors & Co-Authors
Pound-Lana, Gwenaelle
South Africa, Stellenbosch
Stellenbosch University
Aguesse, Frédéric
South Africa, Stellenbosch
Stellenbosch University
McLeary, James B.
South Africa, Stellenbosch
Stellenbosch University
Lange, Ronald F.M.
Germany, Ludwigshafen
Basf se
Klumperman, Bert
South Africa, Stellenbosch
Stellenbosch University
Statistics
Citations: 92
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1021/ma0710075
ISSN:
00249297