Application of 1-allyl-3-(1-butyl)imidazolium chloride in the synthesis of cellulose esters: properties of the ionic liquid, and comparison with other solvents.
The ionic liquid (IL), 1-allyl-3-(1-butyl)imidazolium chloride (AlBuImCl), has been synthesized and its properties determined. Increase in the temperature increased its conductivity and decreased its density, polarity, and viscosity. Microcrystalline cellulose (MCC), dissolves in this IL by heating at 80 degrees C; this did not affect its degree of polymerization, decreased its index of crystallinity (Ic), and changed in morphology after regeneration. Convenient acylation of MCC was achieved by using 50% excess anhydride at 80 degrees C, for 24 or 48 h for acetic and butyric anhydride, respectively. The composition of the mixed esters depended on the initial ratio of the anhydrides, and their order of addition.
Fidale
Ludmila C
LC
Institute of Chemistry, University of São Paulo, São Paulo, S. P., Brazil.
Possidonio
Shirley
S
El Seoud
Omar A
OA
D002482:Cellulose / Q000138:chemical synthesis* / Q000737:chemistry; D004553:Electric Conductivity; D004952:Esters / Q000138:chemical synthesis*; D006358:Hot Temperature; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D012995:Solubility; D012997:Solvents / Q000737:chemistry; D014783:Viscosity
D004952:Esters; D007093:Imidazoles; D052578:Ionic Liquids; D012997:Solvents; C502841:1-butyl-3-methylimidazolium chloride; D002482:Cellulose; C109691:microcrystalline cellulose