The cellulose solutions of various concentrations (5-25wt%) were prepared by mixing cellulose with $NMMO/H_2O$ solvents. The mole ratio of water to NMMO was fixed at 0.8. Propyl-gallate was used as antioxidant to prevent the degradation of cellulose. We could observe the anisotropic phase for the over 20wt% concentration of cellulose solution by PLM. This anisotropic phase could be observed better for the highly sheared sample. The anisotropic-isotropic transition temperature and concentration were measured as common for thermotropic or lyotropic polymer using capillary rheometer under the high shear rate. The transition temperature was between 96℃ and 98℃ and the transition concentration was about 23wt%. This anisotropic-isotropic transition appeared more clearly in the steady mode measurement as compared to dynamic mode. The time-temperature-superposition rule could not be applied to the highly concentrated cellulose solutions with anisotropic phase. But for the solutions of relatively low concentrations in isotropic phase, the time-temperature-superposition rule could be well applied.
