Abstract:

The series of water soluble Nmaleyl chitosan has been obtained in an acid homogeneous solution. And it can be to provide the theory basis for the derivatives applied in the oil and other fields. The effects of the mole ratio of anhydride and the amino group of chitosan in feed solution, time of reaction, temperature of reaction and the concentration of acetic acid on of the derivatives solubility, the percent of remains amino(—NH2%)，the intrinsic viscosity (［η］) have been studied respectively. Results have shown that the mole ratio of anhydride to amino group of chitosan in feed is 1∶2, the optimum reaction time is 5 hours, the reaction temperature is 20℃, and the concentration of acetic acid is 1.3% at lest. The chemical structure of the derivatives has been characterized by FTIR and UV spectrum. From the results, chitosan can be selectively acylated .

Key words: chitosan, maleic anhydride, water solubility, N-maleyl chitosan, derivactive