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Rheological behavior of cellulose nanocrystal suspension: Influence of concentration and aspect ratio
Author(s) -
Wu Qiang,
Meng Yujie,
Wang Siqun,
Li Yanjun,
Fu Shenyun,
Ma Lingfei,
Harper David
Publication year - 2014
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.40525
Subject(s) - rheology , suspension (topology) , cellulose , nanocrystal , viscosity , materials science , chemical engineering , aspect ratio (aeronautics) , composite material , nanotechnology , mathematics , homotopy , pure mathematics , engineering
The steady and dynamic rheological behaviors of two cellulose nanocrystal (CNC) suspensions were investigated over a wide range of concentrations. The viscosity, storage and loss modules increased with increasing CNC concentration, and both CNC suspensions showed three regions in a viscosity‐concentration graph. The two critical concentrations depended on the aspect ratio and corresponded to the overlap and gelation concentration. Because of the higher aspect ratio, switchgrass CNC suspension transitioned into a biphasic state and formed a hydrogel at lower concentrations than those of cotton CNC suspensions. Furthermore, the complex viscosities of both CNC suspensions were higher than their steady viscosities; therefore, neither CNC suspension followed the Cox–Merz rule, which may be attributed to the existence of a liquid crystal domain in each suspension. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40525.
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