Rheology behavior of hydrophobically modified poly(acrylic acid) with twin-tailed pendant in waterethylene glycol mixture

摘要

A hydrophobically modified poly(acrylic acid) (HMPA) with twin-tailed hydrophobic pendant side groups was prepared by precipitation polymerization. The rheology behavior of HMPA was examined in mixtures of water and ethylene glycol (EG) of different proportions. It was shown that the solvent had a direct impact on both the steady and dynamic rheology behaviors of the HMPA solutions. The change of hydrophobic interactions in the EG-rich mixtures may be attributed to the observed decrease in polymer coil dimension together with a lower tendency of the hydrophobes to form junctions. As the temperature decreased, the viscosities and numbers of active junctions of HMPA in water-EG mixtures increased.