Interaction between a tertiary amine methacrylate based polyelectrolyte and a sodium montmorillonite dispersion and its rheological and colloidal properties

Alemdar A., BÜTÜN V.

JOURNAL OF APPLIED POLYMER SCIENCE, cilt.95, sa.2, ss.300-306, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 95 Sayı: 2
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1002/app.21223
  • Dergi Adı: JOURNAL OF APPLIED POLYMER SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.300-306
  • Anahtar Kelimeler: polyelectrolytes, rheology, water-soluble polymers, sodium montmorillonite, zeta potential, TRANSFER RADICAL POLYMERIZATION, TRANSITION-METAL COMPLEXES, DIBLOCK COPOLYMERS, AQUEOUS-MEDIA, 2-(DIMETHYLAMINO)ETHYL METHACRYLATE, AMBIENT-TEMPERATURE, FACILE SYNTHESIS, ADSORPTION, POLYMERS, CLAYS
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

The rheological and colloidal properties of sodium montmorillonite dispersions were investigated in the presence of a special type of cationic polymer [modified poly(ethylene glycol)]. 2-(Dimethylamino) ethyl methacrylate was polymerized with monomethoxy-capped oligo(ethylene glycol) via aqueous atom transfer radical polymerization. The tertiary amine residues of the resulting polymer were then quaternized with methyl iodide to obtain a cationic polyelectrolyte. The rheology and zeta-potential experiments showed that the cationic polymer adsorbed onto the sodium montmorillonite surface strongly. The rheological parameters (plastic viscosity and yield value) were obtained with a rotational low-shear rheometer. The results indicated a gradual increase in gelation with the addition of the cat-ionic polymer, which reached a maximum at a cationic polymer concentration of 0.4-0.8 g/L. This gel-like dispersion showed pronounced thixotropy. A further increase in the polymer concentration resulted in a reduction in this gelation. The adsorption of the cationic polymer onto the clay surface reduced the 6 potential to small values, but no isoelectric point was observed. The basal-spacing measurements showed that the cationic polymer strongly adsorbed onto the sodium montmorillonite instead of entering the montmorillonite layers. (C) 2004 Wiley Periodicals, Inc.