Rheology and structure of aqueous bentonite-polyvinyl alcohol dispersions


Isci S. , UNLU C. H. , ATICI O. , GUNGOR N.

Bulletin of Materials Science, vol.29, no.5, pp.449-456, 2006 (Journal Indexed in SCI Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 5
  • Publication Date: 2006
  • Doi Number: 10.1007/bf02914075
  • Title of Journal : Bulletin of Materials Science
  • Page Numbers: pp.449-456
  • Keywords: bentonite-polyvinyl alcohol dispersions, rheology, zeta potential, particle size analysis, SEM, FTIR studies, WATER SYSTEMS, SUSPENSIONS

Abstract

The influence of polymer on flow behaviour of Balikesir, Turkey bentonite dispersions (2%, w/w) was studied for non-ionic polymer, polyvinyl alcohol (PVA). In a range of 3-3 × 10-6 - 3-3 × 105 mol/l, PVA was added to the bentonite dispersions in different concentrations and its behaviour was observed on rheology parameters. Thlxotropy was detected by a hysteresis loop of the flow curves. The data were Interpreted taking Into account the interactions of colloidal clay particles, bentonitic clay concentrations, structure, and concentrations of added PVA. The particle size analysis was explained by surface orientation of PVA to the clay particles dispersed In aqueous solution. Zeta potential determination also emphasized that PVA molecules got attached on the face and edge surface of clay particles. The morphology of bentonite dispersions was analysed by scanning electron micrograph (SEM). FTIR studies carried out in parallel to rheology studies showed that hydrogen bonds were formed between surface of the clay, and absorbed PVA molecules and adsorbed water. The presence of PVA did not prevent extensive swelling of bentonite. © Indian Academy of Sciences.