2.2 Preparation and Characterization of PILs
These PILs were synthesized by neutralization reaction. Taking a typical
run, 50 mL of the ethanol solution of MeOAc (20 mmol) was added
dropwisely to the ethanol solution of BDMAEE (25 mmol). The reaction was
stirred in an ice bath until it was raised to room temperature and
stirred for 12 hours. Then, ethanol was removed by vacuum distillation
and the remaining crude product was washed three times by diethyl ether
to remove the excess reactant. The product was dried in a vacuum at 60
ÂșC for 24 hours to remove trace solvents, and finally, a clear liquid
[BDMAEEH][MeOAc] was obtained.