The use of dielectric spectroscopy for the characterisation of the precipitation of hydrophobically modified poly(acrylic-acid) with divalent barium ions

Peter Vittrup Christensen, Kristian Keiding

Research output: Contribution to journalJournal articleResearchpeer-review

4 Citations (Scopus)

Abstract

The use of dielectric spectroscopy as a monitor for coagulation processes was investigated. Hydrophobically modified poly(acrylic-acid) polymers were used as model macromolecules and coagulated with barium ions. The coagulation process was quantified using a photometric dispersion analyser, thereby serving as a point of reference for the dielectric spectroscopy. It was found that the hydrophobic modification increased the dosage of barium needed to obtain complete coagulation, whereas the dosage required to initiate coagulation was lowered. The coagulation of the polymer samples caused the relaxation time of the measured dielectric dispersion to increase, and this parameter was found to be a good indicator of the formation of polymer aggregates. The magnitude of the dielectric dispersion decreased as a function of barium dosage, but when coagulation was initiated an increase was observed. The observed agreement between the onset of coagulation and the changes in the dielectric dispersion shows the potential use of dielectric spectroscopy for the characterisation of coagulation processes.
Original languageEnglish
JournalJournal of Colloid and Interface Science
Volume340
Issue number1
Pages (from-to)46-52
Number of pages7
ISSN0021-9797
Publication statusPublished - 1 Dec 2009

Keywords

  • Dielectric spectroscopy
  • Precipitation
  • Coagulation
  • Polyelectrolyte
  • Ion condensation
  • On-line measurement
  • Hydrophobic interaction

Fingerprint

Dive into the research topics of 'The use of dielectric spectroscopy for the characterisation of the precipitation of hydrophobically modified poly(acrylic-acid) with divalent barium ions'. Together they form a unique fingerprint.

Cite this