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.
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Original Russian Text © D.D. Grinshpan, A.N. Gonchar, T.A. Savitskaya, N.G. Tsygankova, S.E. Makarevich, 2014, published in Vysokomolekulyarnye Soedineniya. Ser. A, 2014, Vol. 56, No. 2, pp. 142–151.
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Grinshpan, D.D., Gonchar, A.N., Savitskaya, T.A. et al. Rheological properties of cellulose-chitosan-phosphoric acid systems in different phase states. Polym. Sci. Ser. A 56, 137–145 (2014). https://doi.org/10.1134/S0965545X14020059
- Shear Rate
- Polymer Science Series
- Cellulose Solution