Picture of a black hole

Strathclyde Open Access research that creates ripples...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of research papers by University of Strathclyde researchers, including by Strathclyde physicists involved in observing gravitational waves and black hole mergers as part of the Laser Interferometer Gravitational-Wave Observatory (LIGO) - but also other internationally significant research from the Department of Physics. Discover why Strathclyde's physics research is making ripples...

Strathprints also exposes world leading research from the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

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

Full text not available in this repository. (Request a copy from the Strathclyde author)

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.