Superior Solubility of Polysaccharides in Low Viscosity,Polar,and Halogen-Free 1,3-Dialkylimidazolium Formates

摘要

We successfully prepared low viscosity,polar,and halogen-free ionic liquids as potential solvents for a wide range of polysaccharides.A series of 1,3-dialkylimidazolium formates were produced as liquids having strong hydrogen bond acceptability.These formates had significantly lower viscosity than previously reported polar ionic liquids,in particular l-allyl-3-methylimidazolium formate (viscosity 66cP at 25 deg C) and 1-allyl-3-ethylimidazolium formate (67cP at 25 deg C).Because of their strong hydrogen bond ability,various polysaccharides including amylose and (scarcely soluble) cellulose were dissolved in high concentrations under mild condition.