Synthesis and characterization of carboxymethyl Cassia tora gum
Carboxymethyl (CM)-Cassia tora gum (CTG) with high degree of substitution (DS) was prepared with CTG as raw material,monochloroacetic acid (MCA) as carboxymethyl ether agent,isopropanol as dispersant.The variables studied were the dosage of reactants,the ratio of solid to liquid,alkalization time and temperature,etherification time and temperature,to find the influence on the DS.The results show that when the n(MCA)/n(CTG) is 1.6: 1,the ratio of solid to liquid is 1: 2.5,alkalization temperature is 40 ℃,the alkalization time is 60 min,the etherification temperature is 53 ℃ and the time is 3.0 h,the DS of CM-CTG is 0.64 and the reaction efficient is 79.5％.Compared with the original powder,the CM-CTG solution stability was longer,little change in viscosity within 6 days.The structure and thermal properties were analyzed by FTIR,13C-NMR and TGA.
Cassia tora gumcarboxymethylviscositydegree of substitution
国家科技期刊平台
NSTL
万方数据
维普
