Macromolecular Research

, Volume 24, Issue 5, pp 463–470 | Cite as

Molecular Characterization on the Anomalous Viscosity Behavior of Cellulose Solutions in N,N-Dimethyl Acetamide and Lithium Chloride

Article

Abstract

The physical properties of dilute cellulose solutions in N,N-dimethyl acetamide (DMAc) including 9 wt% lithium chloride (LiCl) were investigated in terms of concentration, temperature and molecular weight of cellulose. Over the concentration range of 0.01 to 2.5 g/dL, the viscosity of the cellulose solutions exhibited a lower critical solution temperature (LCST) behavior which proved thermoreversible between 30 and 60 °C. The LCST behavior was further supported by dynamic light scattering measurement. In the extremely dilute concentration range, 0.01 to 0.08 g/dL, the reduced viscosity (ηred) of cellulose solutions was increased with decreasing concentration. The anomalous coil expansion with decreasing concentration could be explained by the increase of the conductivity of cellulose solutions with decreasing concentration, which was also verified by dynamic light scattering experiment. In the concentration range of 0.1 and 2.5 g/dL, both cellulose solutions gave a drastic increase of ηred in the vicinity of the critical concentration (C*), 0.9 g/dL. The slope of the curve of ηred vs. concentration was higher for the cellulose of higher molecular weight, but it did not change with temperature between 30 and 60 °C.

Keywords

cellulose N,N-dimethylacetamide/LiCl LCST behavior thermoreversibility polyelectrolyte effects 

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Copyright information

© The Polymer Society of Korea and Springer Sciene+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Department of Organic & Nano EngineeringHanyang UniversitySeoulKorea

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