Premium
Rheological study on O −carboxymethylated chitosan/cellulose polyblends from LiCl/ N,N ‐dimethylacetamide solution
Author(s) -
Li Zhi,
Zhuang Xupin,
Liu Xiaofei,
Guan Yunlin,
Yao Kangde
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.11790
Subject(s) - dimethylacetamide , rheology , cellulose , materials science , viscosity , emulsion , hydroxypropyl cellulose , polymer chemistry , hydroxyethyl cellulose , methyl cellulose , chemical engineering , composite material , organic chemistry , chemistry , polymer , solvent , engineering
An O −carboxymethylated chitosan ( O − CMCh) water solution (I) and N,N ‐dimethylacetamide (DMAc) emulsion (II) were blended with a cellulose LiCl/DMAc solution, and corresponding polyblends (Polyblends I and II) were obtained. The rheology of the three fluids, that is, the cellulose solution and Polyblends I and II, was investigated. The cellulose solution was characterized by a power‐law fluid. When an O ‐CMCh water solution or DMAc emulsion was added to the cellulose solution, the power‐law curve was preserved. The power‐law indexes ( n ) of all three fluids increased along with the temperature. Polyblend I displays an n close to but a little higher than that of the cellulose solution, while Polyblend II shows a much higher power index than those of the other two fluids. The values of the apparent viscosity (η a ) for all the three fluids are close and decrease along with an increase in the temperature. Adding O ‐CMCh microparticles into Polyblends I and II results in a decrease in the structural viscosity index (Δη) in comparison to that of the cellulose solution, and this effect is very obvious for Polyblend I. A cellulose solution's Δη declines with the augmentation of temperature, while the Δη's of both Polyblends I and II show minimum values at about 323 K. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1719–1725, 2003