Preparation and structural manipulation of cellulose aerogel in ionic liquid solvent system
Cellulose aerogels were obtained by cellulose homogeneous solution using cotton linter as raw material and ionic liquid as dissolution system.When 1-allyl-3-methylimidazolium chloride salt was used as the solvent system,the concentration of cotton linter was 2％and the polymerization degree was 1 500,the specific surface area of cellulose aerogel obtained by vacuum freeze-drying using tert-butanol as replacement solvent could reach 288.731 0 m2/g,and the pore volume was 2.252 8 cm3/g,the pore size was 30.94 nm.And the effects of ionic liquid type,drying method,cellulose polymerization degree,cellu-lose concentration and solvent replacement type on the microstructure of cellulose aerogels were investiga-ted by BET,SEM,XRD,FTIR,TG/DTG analysis.
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