Role of polymeric dispersant functional groups in the dispersion behaviour of titania pigment particles

Saeed Farrokhpay, Gayle Morris, Daniel Fornasiero, Peter Self

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Citations (Scopus)


The adsorption of polymeric dispersants onto titania pigment particles has been investigated at pH 9.5 as a function of the type of polymer functional group, using polyacrylic acid and modified polyacrylamides. The polyacrylamides include homopolymer and copolymers with either hydroxyl groups or carboxylate and hydroxyl groups. The experimental methods used were adsorption isotherm, zeta potential, particle size measurements and rheology. The anionic dispersants increased the magnitude of the titania pigment particle zeta potential, while the nonionic dispersants had a negligible effect. Both polyacrylic acid and polyacrylamide copolymers altered the titania pigment dispersion behaviour, reducing the suspension yield stress and the mean pigment particle size, while the polyacrylamide homopolymer had a negligible effect on the pigment dispersion properties. Generally the optimum dispersion effect (minimum particle yield stress and particle size) coincided with the polymer adsorption density; however, for polyacrylic acid, the maximum dispersion effect occurred prior to maximum adsorption. Acrylamide polymer functional groups adsorbed onto the pigment surface but they were unable to influence the pigment particle dispersion properties; however, adsorption and dispersion properties were enhanced in the presence of hydroxyl groups.
Original languageEnglish
Title of host publicationProgress in Colloid and Polymer Science
Number of pages5
Publication statusPublished - 1 Dec 2004
Externally publishedYes
EventProgress in Colloid and Polymer Science -
Duration: 1 Dec 2004 → …

Publication series

NameProgress in Colloid and Polymer Science
ISSN (Print)0340-255X


ConferenceProgress in Colloid and Polymer Science
Period1/12/04 → …


  • Polyacrylamide
  • Polymer functional groups
  • Rheology
  • Titania pigment
  • Zeta potential


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