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

S. Graham, P.A.G. Cormack, D.C. Sherrington

Research output: Contribution to journalArticle

73 Citations (Scopus)

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.
LanguageEnglish
Pages86-90
Number of pages4
JournalMacromolecules
Volume38
Issue number1
DOIs
Publication statusPublished - 11 Jan 2005

Fingerprint

divinyl benzene
Spectroscopic analysis
Polyelectrolytes
Polymers
Nuclear magnetic resonance
Methylation
Acids
Size exclusion chromatography
Gelation
Free radical polymerization
Macromolecules
Esters
Viscosity
Chemical analysis
methacrylic acid
trimethylsilyldiazomethane
polymethacrylic acid

Keywords

  • HYPERBRANCHED POLYMERS
  • DENDRITIC MACROMOLECULES
  • METHACRYLATE COPOLYMERS
  • ARCHITECTURE
  • POLYMERIZATION
  • POLYESTERS
  • FACILE

Cite this

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title = "One-pot synthesis of branched poly(methacrylic acid)s and suppression of the rheological 'polyelectrolyte effect'",
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.",
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One-pot synthesis of branched poly(methacrylic acid)s and suppression of the rheological 'polyelectrolyte effect'. / Graham, S.; Cormack, P.A.G.; Sherrington, D.C.

In: Macromolecules, Vol. 38, No. 1, 11.01.2005, p. 86-90.

Research output: Contribution to journalArticle

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T1 - One-pot synthesis of branched poly(methacrylic acid)s and suppression of the rheological 'polyelectrolyte effect'

AU - Graham, S.

AU - Cormack, P.A.G.

AU - Sherrington, D.C.

PY - 2005/1/11

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N2 - 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.

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