Influence of Carboxyl Charge Density on Properties of Extruded Cellulose Films

Modified pure cellulose-based films were prepared via a scalable process by cellulose carboxymethylation, producing an alkaline dope and flow casting through a slit in an acid bath, followed by washing and drying. The effect of different carboxyl charge densities (0.9, 1.5, and 2.5 mmol/g) on several properties of the films was investigated. Fourier transform infrared and nuclear magnetic resonance spectroscopy showed the formation of carboxyl...