Reactive Extrusion for In-situ Chemical Modification of Cellulose with De-Octenyl succinic anhydride (DDSA) in presence of Ionic liquid

摘要

Modification of microcrystalline cellulose by means of DDSA through the reactive extrusion process was preformed. The process was carried out by twin screw extruder in the presence of ionic liquids (IL), 1-butyl-3- methylimidazolium chloride [Bmim]Cl. The suitable composition for cellulose/IL mixture and optimum conditions for extrusion process were determined. Degree of substitution (DS) for modified cellulose was found to be in the range of 0.100- 0.284. In order to study the chemical structure and the physical properties of the modified cellulose, characterization was done by FT-IR, solid-state CP/MAS 13CNMR, and theromgravimetric analysis. FT-IR data were found to have a new peak in contrast to original reactant which clearly indicated the presence of a chemical group. CP/MAS 13CNMR analysis approved the existence of succinylation between cellulose and DDSA. The TGA analysis showed that the thermal stability of modified cellulose was decreased upon increasing of the degree of substitution (DS) or the increasing of the amount of DDSA in the samples.