The Effect of Water on Rheology of Native Cellulose/Ionic
Liquids Solutions
Behzad Nazari
Nyalaliska W. Utomo
Ralph H. Colby
10.1021/acs.biomac.7b00789.s001
https://acs.figshare.com/articles/journal_contribution/The_Effect_of_Water_on_Rheology_of_Native_Cellulose_Ionic_Liquids_Solutions/5346262
Cellulose coagulates
upon adding water to its solutions in ionic
liquids. Although cellulose remains in solution with much higher water
contents, here we report the effect of 0–3 wt % water on solution
rheology of cellulose in 1-butyl-3-methylimidazolium chloride and
1-ethyl-3-methylimidazolium acetate. Fourier transform infrared spectroscopy,
thermal gravimetric analysis, and polarized light microscopy were
also used to study water absorbance to the solutions. Tiny amounts
of water (0.25 wt %) can significantly affect the rheological properties
of the solutions, imparting a yield stress, while dry solutions appear
to be ordinary viscoelastic liquids. The yield stress grows linearly
with water content and saturates at a level that increases with the
square of cellulose content. Annealing the solutions containing small
amounts of water at 80 °C for 20 min transforms the samples to
the fully dissolved “dry” state.
2017-08-09 00:00:00
20 min
gravimetric analysis
water content
1- butyl -3-methylimidazolium chloride
Tiny amounts
rheological properties
study water absorbance
1- ethyl -3-methylimidazolium acetate
water contents
solution rheology
light microscopy
cellulose content