Structural characteristics of bamboo cellulose fractions

To promote effective use of bamboo cellulose,the structural characteristics of three fractional bamboo celluloses by fractional separation were studied.The results demonstrated that weight-average relative molecular weight(MW) of cellulose gradually decreased because of the deepening fracture degree of cellulose molecular chain with the increasing of fractional grade.The 1st,2nd,and 3rd grade fractional celluloses are of pure ones,no typical absorption peaks related to lignin and hemicellulose appeared on their infrared spectra.After fractional separation,the physical structures of the three fractional celluloses occurred great change,many holes and ditches were distributed on the loose surface of the cellulose fibers.The length and crystalline degree of the first,second and third fractional cellulose decreased in proper order,while the enzymolysis efficiency increased gradually.Thus it can be seen that the processing and application characteristics of the first,second and third fractional cellulose may be improved.