Viscometric Study of Cellulose in Pf/Dmso Solution

Cellulose samples were found to be soluble in PF/DMSO to form a genuine dilute solution without suffering obvious degradation under adequate conditions. The Mark-Houwink-Sakurada equation for cellulose in PF/DMSO at 30°C obtained here was [η] = 3.01 × DP0.81 where [η] is in the unit of cm3·g−1. The intrinsic viscosity of cellulose in Cadoxen, FeTNa, PF/DMSO and DMAc/LiCl was in the following order: [η]DMAc LiCl >[η]PF/ DMSO>[η]FeTNa >[η]Cadoxen, and the same tendency for the values of the parameter α. The intrinsic viscosity can be considered as an indication of the dimension of cellulose macromolecular chains in different solvent systems.