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Influence of a Type of Electrolyte and its Ionic Strength on the Adsorption and the Structure of Adsorbed Polymer Layer in the System: Polyacrylic Acid/SiO₂

Stanisław Chibowski ; Faculty of Radiochemistry and Chemistry of Colloids, Department of Chemistry, Maria Curie Skłodowska University, M. Skłodowskiej - Curie 3 Sq., 20-031 Lublin, Poland
Elżbieta Grządka ; Faculty of Radiochemistry and Chemistry of Colloids, Department of Chemistry, Maria Curie Skłodowska University, M. Skłodowskiej - Curie 3 Sq., 20-031 Lublin, Poland
Jacek Patkowski ; Faculty of Radiochemistry and Chemistry of Colloids, Department of Chemistry, Maria Curie Skłodowska University, M. Skłodowskiej - Curie 3 Sq., 20-031 Lublin, Poland

Sažetak

The influence of ionic strength and the molecular weight of polyacrylic acid (PAA) on its adsorption and the structure of adsorbed polymer layer on SiO₂ surface in the presence NaCl and CaCl₂ was measured. Thickness of PAA adsorption layers on the SiO₂ surface in these two electrolytes were also measured as well as the expansion coefficient (α) of PAA in CaCl₂. The increase of: ionic strength, pH, and the polymer molecular weight causes the increase of PAA adsorption layers thickness. However, PAA expansion coefficient increases with the increase of pH and the polymer molecular weight, but decreases with the increase of ionic strength. The influence of a type of electrolyte and its ionic strength on the zeta potential of SiO₂ in the presence of polyacrylic acid (PAA) was measured. As it was observed, the zeta potential is much lower in CaCl₂ solution in comparison to the zeta potential in NaCl.

Ključne riječi

polymer adsorption; polymer conformation; adsorption layer thickness; polyacrylic acid; ionic strength

Hrčak ID:

45461

URI

https://hrcak.srce.hr/45461

Datum izdavanja:

11.12.2009.

Posjeta: 3.027 *