Influence of temperature on the solution rheology of cellulose in 1-ethyl-3-methylimidazolium chloride/dimethyl sulfoxide
Rheological properties of cellulose solutions in 1-ethyl-3-methylimidazolium chloride/dimethyl sulfoxide ([Emim]Cl/DMSO, 7/3, w/w) in a wide range of concentration and temperature were investigated. The viscosity of cellulose/[Emim]Cl/DMSO solution agrees well with the complex viscosity suggesting Cox–Merz law is valid for the solution. The viscosity contributed by cellulose (η 0–η s ) and cellulose concentration (c) scales as (η 0–η s )~c n with n in the range of 2.00–1.57 and 4.52–3.79 in semidilute unentangled and semidilute entangled regimes, respectively, in the temperature of 25–100 °C. Intrinsic viscosity of the solutions remains constant at temperature below 60 °C and decreases linearly with the increase of temperature above 60 °C. The activation energy of cellulose/[Emim]Cl/DMSO solution increases with the increase in cellulose concentration. The chain dynamics of cellulose in [Emim]Cl/DMSO follows Zimm model and Rouse model in dilute regime (lower than 0.5 wt%) and semidilute unentangled regime (between 0.5 and 2 wt%), respectively.
KeywordsCellulose ILs/DMSO Solution structure Intrinsic viscosity Chain dynamics
Financial support from the National Natural Science Foundation of China (Grant Nos. 21274154, 51473174, and 51373191) are gratefully appreciated.
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