Surface acetylation of bamboo cellulose: preparation and rheological properties.

Abstract In this study, purified bamboo cellulose was used to synthesize cellulose diacetate (B-CDA). The synthesis was controlled by determination of the degree of substitution and insoluble residue content. The product then was characterized by FTIR. The rheological properties of B-CDA solutions in acetone/N,N-dimethylacetamide (DMAc) solvent system were systematically investigated on an advanced rheometer, including the dependence of apparent viscosity η α , non-Newtonian index n , and structural viscosity index Δ η on the concentration and temperature of the solutions. B-CDA–acetone/DMAc solution is a shear-thinning fluid. With increasing solution concentration and decreasing temperature, Δ η increased, whereas n decreased, which indicates a deteriorating spinnability. Moreover, the values of the viscous flow activation energy E η based on the Arrhenius equation increased when the shear rate γ was enhanced, which indicates that the η α of the solution is more sensitive to temperature in the higher γ values. The results are favorable for predicting the B-CDA solution spinnability.