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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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One-pot synthesis of branched poly(methacrylic acid)s and suppression of the rheological 'polyelectrolyte effect'

Graham, S. and Cormack, P.A.G. and Sherrington, D.C. (2005) One-pot synthesis of branched poly(methacrylic acid)s and suppression of the rheological 'polyelectrolyte effect'. Macromolecules, 38 (1). pp. 86-90. ISSN 0024-9297

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Abstract

A novel synthesis of branched poly(methacrylic acid)s (PMAAs) is reported via conventional solution free radical polymerization of MAA with divinylbenzene (DVB) as the branching comonomer. Controlled levels of dodecanethiol (DDT) have been used successfully to inhibit network formation and gelation. Quantitative methylation of the branched polymers has been achieved using trimethylsilyldiazomethane, and subsequent H-1 NMR spectroscopic analysis of both the acid polymers and their methyl esters has allowed quantification of their molecular composition. Characterization of the branched architecture was carried out using dual detection size exclusion chromatography (DDSEC) and was confirmed by H-1 NMR spectroscopic analysis. A pH dependence study of the dilute solution reduced viscosity of the branched poly(methacrylic acid)s in 10 Vol % MeOH/H2O has shown almost complete suppression of the polyelectrolyte effect which we attribute to the branched architecture of these macromolecules.