Influence of polymer functional group architecture on titania pigment dispersion

Farrokhpay, Saeed, Morris, Gayle E., Fornasiero, Daniel and Self, Peter (2005) Influence of polymer functional group architecture on titania pigment dispersion. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 253 1-3: 183-191.


Author Farrokhpay, Saeed
Morris, Gayle E.
Fornasiero, Daniel
Self, Peter
Title Influence of polymer functional group architecture on titania pigment dispersion
Journal name Colloids and Surfaces A: Physicochemical and Engineering Aspects   Check publisher's open access policy
ISSN 0927-7757
1873-4359
Publication date 2005-02-01
Year available 2004
Sub-type Article (original research)
DOI 10.1016/j.colsurfa.2004.11.019
Volume 253
Issue 1-3
Start page 183
End page 191
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract The influence upon adsorption of polymers containing different functional groups on the dispersion behaviour of titania pigment particle has been investigated at pH 6.0 and 9.5. The polymers chosen are polyacrylic acid and modified polyacrylamides including homo and copolymers modified with carboxylate and/or hydroxyl groups. A range of experimental methods including polymer adsorption isotherms, zeta potential, rheology and particle size measurements were used to assess the dispersion effect of the polymers. Adsorption of polyacrylic acid and anionic polyacrylamide copolymers onto the titania pigment surface is greatest when electrostatic repulsion is absent. At low pH values, below the pigment isoelectric point (iep), the adsorption density of the anionic polymers on titania pigment was high whilst at higher pH values, above the pigment iep, the adsorption density decreased. However, the adsorption of non-ionic polymers on titania pigment was less influenced by the pH. The presence of carboxylate functional groups in both polyacrylic acid and anionic polyacrylamide copolymer altered the titania pigment dispersion behaviour, reducing the suspension yield stress and mean particle size. The polyacrylamide homopolymer had negligible effect on the pigment dispersion properties at pH 9.5, while it caused pigment particle aggregation at pH 6.0. The hydroxyl-modified polyacrylamide had also a de-stabilisation effect on the pigment dispersion at pH 6.0, but decreased the yield stress and the mean particle size at pH 9.5. The stabilisation effect of both anionic and non-ionic polymers was pH-dependent. The dispersion properties of the pigment particles are largely predicted by DLVO theory.
Keyword Titania pigment
Polyacrylic acid
Polyacrylamide
Dispersion
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Available online 22 December 2004

Document type: Journal Article
Sub-type: Article (original research)
Collection: Julius Kruttschnitt Mineral Research Centre Publications
 
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Created: Mon, 22 Aug 2011, 13:30:39 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre