HIGH-TEMPERATURE PRESSURE RHEOLOGY OF CARBOXYMETHYL CELLULOSE (CMC)

Rheological properties of 0.5-2.0% carboxymethyl cellulose (CMC) solut ions were evaluated using a computer controlled rotational viscometer under a dynamic upward and downward linear-ramp shearing sequence. Exp eriments were performed in the temperature range 60-140 degrees C usin g a high temperature/high pressure sensor system. Rheological paramete rs were evaluated using different models (power law, Herschel-Bulkley, Casson and linear), while the temperature and time dependency of thes e parameters were evaluated using Turian and Weltmann models, respecti vely. All theological properties were significantly (p < 0.01)influenc ed by both temperature and concentration.