Abstract:

The crop straw resources are very plentiful in natureIn this paper the crop straws were used as raw material for acetylation after activation with unpolluted steam explosionAccording to different solubilities of acetylated products, cellulose acetate were prepared by solvent extractionThe results indicated that the reaction activity increased dramatically after steam explosion, and the best reaction condition was that the straws were acetylated at 123℃ for 2 h in the presence of 7% catalystAfter pretreatment of steam exploded straw with a neutral detergent, good result of acetylation for crop straw could be obtainedThe acetylationconversion and mass increase were enhanced most for wheat strawThe degree of polymerization and substitution of cellulose acetate achieved were over 120 and 2.80 respectivelyThe product was characterized with IR and 1H NMRCompared with high α-cellulose as raw material, not only the cost was very low ,but also the process was simplified greatly.