title: 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 Δη 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, Δη 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.
authors.affiliation: College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Cai
authors.forename: Peng
authors.initials: P
authors.lastname: Fei
authors.forename: Zhouyi
authors.initials: Z
authors.lastname: Xiong
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Shi
authors.forename: Kai
authors.initials: K
authors.lastname: Yan
authors.forename: Hanguo
authors.initials: H
authors.lastname: Xiong
mesh_terms: D000107:Acetylation; D002482:Cellulose / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification; D012212:Rheology; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014783:Viscosity
chemical_list: D002482:Cellulose; C026170:cellulose diacetate