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 0024-9297Full text not available in this repository. (Request a copy from the Strathclyde author)
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.
|Keywords:||HYPERBRANCHED POLYMERS, DENDRITIC MACROMOLECULES, METHACRYLATE COPOLYMERS, ARCHITECTURE, POLYMERIZATION, POLYESTERS, FACILE, Chemistry, Materials Chemistry, Organic Chemistry, Polymers and Plastics, Inorganic Chemistry|
|Subjects:||Science > Chemistry|
|Department:||Faculty of Science > Pure and Applied Chemistry
|Depositing user:||Mr Derek Boyle|
|Date Deposited:||16 Mar 2006|
|Last modified:||29 Apr 2016 07:46|