羧甲基壳聚糖季铵盐的合成及其絮凝性能研究.pdfVIP

Abstract In this thesis,using the Chitosan for raw material and 3-chloro-2-hydroxypropyl trimethyl ammonium chloride (CTA) for the modification reagents, the quaternary ammonium salt of chitosan had been prepared in isopropyl alcohol - water-phase medium; and on this basis, using chloroacetic acid (ClCH2 COOH) as modifier, carboxymethyl chitosan quaternary ammonium salt (CM-CTACTS) had been prepared .And the chitosan derivates were used to treate the Starch juice. When the quaternization of the chitosan was being done,the synthetic condition of quaternary ammonium chitosan was optimized.The optimum condition for synthesizing the CTA-CTS was as follows:molar ratio of Sodium hydroxide to 3 - chloro -2 - hydroxypropyl trimethy l ammonium chloride was 1.1:1,3 - chloro -2 - hydroxypropyl trimethyl ammonium chloride to chitosan was 5:1,reaction temperature was 75 ℃,reaction time was 8h.The product was Light yellow powder, It can dissolve in water and its DS(degree of substitution)approached to 79%.The product was also characterized by FTIR and X-ray diffraction.The results of FTIR and X-ray analys is had showed that the quaternary ammonium chitosan were synthesized. Using the chloroacetic acid (ClCH2 COOH) as the carboxymethylation reagent, the quaternary ammonium salt of carboxymethyl chitosan (CM-CTACTS)was prepared. The optimum conditions for the carboxylation of CTA-CTS were as follows ：molar ratio of Sodium hydroxide to CTS-C