Reversible Flocculation with Hydroxypropyl Guar−Borate, A Labile Anionic Polyelectrolyte

Cationic polystyrene latex was flocculated with mixtures of hydroxypropyl guar (HPG) and boric acid, which form an anionic polyelectrolyte HPG−borate. Flocculation could be reversed by either lowering pH or by adding fructoseboth procedures remove labile borate ions weakly bound to the HPG chains....

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Bibliographic Details
Published in:Langmuir 2009-01, Vol.25 (1), p.192-195
Main Authors: Pelton, Robert, Hu, Zhen, Ketelson, Howard, Meadows, David
Format: Article
Language:English
Subjects:
Anions
Chemistry
Colloidal state and disperse state
Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams
Electrolytes - chemistry
Exact sciences and technology
Flocculation
General and physical chemistry
Polysaccharides - chemistry
Surface physical chemistry
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Summary:Cationic polystyrene latex was flocculated with mixtures of hydroxypropyl guar (HPG) and boric acid, which form an anionic polyelectrolyte HPG−borate. Flocculation could be reversed by either lowering pH or by adding fructoseboth procedures remove labile borate ions weakly bound to the HPG chains. Mixtures of phenyl boronic acid (PBA) and HPG also flocculate latex although the range of HPG−PBA concentrations, giving flocculation was much narrower than HPG−borate. The differences were explained by the tendency of borate ion to cross-link HPG chains, whereas PBA is monofunctional and cannot cross-link HPG.
ISSN:0743-7463
1520-5827
DOI:10.1021/la803095q