Rheological properties of cellulose-chitosan-phosphoric acid systems in different phase states

Rheological properties of 7.0–9.1% cellulose-chitosan suspensions, solutions, and gels in aqueous phosphoric acid were examined in various modes of shear flow in the range 0.15–100 s −1 at 268–323 K. During steady state flow, the appearance of a quasi-Newtonian region was detected at shear rates bet...

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Bibliographic Details
Published in:Polymer science. Series A, Chemistry, physics Chemistry, physics, 2014-03, Vol.56 (2), p.137-145
Main Authors: Grinshpan, D. D., Gonchar, A. N., Savitskaya, T. A., Tsygankova, N. G., Makarevich, S. E.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Gels
Mathematical models
Natural Polymers
Polymer Sciences
Rheological properties
Shear flow
Shear rate
Spinning
Steady state
Streams
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Summary:Rheological properties of 7.0–9.1% cellulose-chitosan suspensions, solutions, and gels in aqueous phosphoric acid were examined in various modes of shear flow in the range 0.15–100 s −1 at 268–323 K. During steady state flow, the appearance of a quasi-Newtonian region was detected at shear rates between 20 and 40 s −1 owing to orientational ordering of macromolecules in the stream. Under the conditions of transient shear flow at a constant shear rate, rheopexy was observed in both cellulose solutions and cellulose-chitosan solutions. The thixotropic behavior of cellulose-chitosan suspensions, spinning solutions, and gels was characterized during a sharp drop of shear rate from 0.15 to 10 s −1 , that is, under conditions modeling the processes of transport and extrusion of spinning solutions.
ISSN:0965-545X
1555-6107
DOI:10.1134/S0965545X14020059