Abstract:

A kind of cationic polymer was synthesized by means of quaternization , with sugarcane bagasse hemicel-luloses as the raw material , 3-chloro-2-hydroxypropyltrimthylammonium chloride as the cationic reagent and etha-noVwater mixture as the reaction system. By optimizing the synthesizing conditions , a series of soluble cationic hemicelluloses with the degree of substitution from 0. 002 to 0. 02 were prepared. The structure of the modified hemicelluloses was then examined by means of FT -IR and 13 CNMR , and the relative molecular masses of the hemi-celluloses before and after the modification were measured by means of GPC , revealing a decreased relative molecu-lar mass after the modification. The thermal stabilities of the hemicelluloses before and after the modification were finally studied by using a simultaneous thermal analyzer. The results show that the thermal stability of the modified hemicelluloses decreases.

Key words: sugarcane bagasse, hemicellulose, quaternization, synthesis, characterization