Conclusions
At concentrations greater than 30 and 35% by wt., respectively, solutions of ethyl cellulose and hydroxypropyl cellulose at 20°C go over into the liquid-crystalline state.
The flow curves of the liquid-crystalline solutions are characterized by the presence of three sections which correspond (as stress increases) to the following: a yield point and orientation decrease in viscosity; “quasi-Newtonian” flow of aggregates of a constant size; and flow of the fragmented preparation with presence of turbulent streams.
Maxima are clearly discernible on the concentration and temperature dependences of viscosity in the region of the transition into the liquid-crystalline state.
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Literature cited
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S. P. Papkov and V. G. Kulichikhin, The Liquid-crystalline State of Polymers [in Russian], Khimiya, Moscow (1977), 240 pp.
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Additional information
Translated from Khimicheskie Volokna, No. 2, pp. 42–44, March–April, 1985.
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Kulichikhin, V.G., Petrova, L.V., Khanchich, O.A. et al. Concentration and temperature dependences of the viscosity of liquid-crystalline solutions of cellulose ethers. Fibre Chem 17, 148–151 (1985). https://doi.org/10.1007/BF00543474
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DOI: https://doi.org/10.1007/BF00543474