Adsorption of a Low-Molecular-Weight Polyacrylic Acid on Silica, Alumina, and Kaolin

✍ Scribed by Abbas A. Zaman; Ryuta Tsuchiya; Brij M. Moudgil

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 104 KB
• Volume: 256
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.2001.7941

✦ Synopsis

Polyelectrolytes are often used to prepare highly concentrated dispersions of particles of heterogeneous surfaces of controlled viscosity and stability. However, there is not a satisfactory understanding of the adsorption mechanism of polymers on the surface of heterogeneously charged particles such as kaolin. A systematic investigation of the interaction of silica, alumina, and kaolin, with Na-polyacrylic acid (PAA) polyelectrolyte was performed by conducting adsorption experiments and employing attenuated total reflection infrared spectroscopy (FTIR/ATR) techniques. Adsorption studies indicate that the adsorption density of Na-PAA on the surface of kaolin is considerably smaller than that on alumina particles and there is no indication of adsorption of PAA on the surface of silica particles. FTIR/ATR experiments confirmed that there are specific interactions between PAA and the surface of alumina and kaolin particles as the adsorption bands are shifted to higher wavenumbers.