Combining Rheology and Spectroscopy for Studying of Polymeric Materials Subjected to High-Pressure Carbon Dioxide

摘要

A rotational viscometer has been adapted to measure the viscosity of liquid polymers and silica suspensions. The viscosity reduction of poly(propyleneglycol) (PPG) with CO_2 was studied. The effect of CO_2 on silica suspensions in PPG proved to be dependent on the surface chemistry of the silica. Suspensions of hydrophilic silica gel under CO_2 atmosphere but the viscosity of suspensions of hydrophobic silica is reduced by CO_2. These rheological data were correlated with information on the associated polymer swelling and concentration of dissolved CO_2 obtained by the spectroscopic approach.