【Abstract】 The carboxyethyl chitosan(CEC)was synthesized by chitosan as materails with acrylic acid by Michael reaction.The factors such as mass ratio,pH value,time and temperature were investigated and the structure of the CEC was characterized by FT-IR,1H NMR.The results show:the mass ratio is 1:4,the best pH value is 6,the time is 5h and the optimum temperature is 90℃,the substitution degree of CEC is 0.75.The reaction proceeded in a short time compared with literature,The carboxyethylation mainly occurred on NH2.更多还原