From dilute polyelectrolyte solutions to entangled polyelectrolyte networks: a study of sodium carDoxymetnyl cellulose in water by light scattering and rheology

摘要

• Ageing phenomena are concentration dependent: - Low C_(No CMC) (semi-dilute regime): t ↗ ⇒ η ↘ - High C_(No CMC) (concentrated regime): t ↗ ⇒ η ↗ and significant change in the viscosity curve • Suggested ageing causes: - Chain degradation - Changes in chain conformation • Viscosity of the 1 5% Na CMC solution under constant stresses: stress-dependent • Further investigations: - Size-Exclusion Chromatography (SEC) over time to check for chain degradation - Light scattering study on the most concentrated solutions.