壳聚糖与丙烯酰胺接枝共聚物的制备及其性能研究

Study on Preparation and Property of Chitosan-acrylamide Graft Copolymer

采用接枝共聚法,以K2S2O8-NaHSO3氧化还原引发体系为引发剂,使壳聚糖与丙烯酰胺进行自由基接枝共聚反应合成了壳聚糖-丙烯酰胺接枝共聚物。研究了K2S2O8的浓度、NaHSO3的浓度、壳聚糖与丙烯酰胺的质量比、反应温度、反应时间等因素对接枝率和接枝效率的影响。最适宜的反应条件是:c(K2S2O8)=3.0mmol/L,c(NaHSO3)=2.0mmol/L,m(壳聚糖)∶m(丙烯酰胺)=1∶5,反应温度50℃,反应时间3.5h。用FTIR表征壳聚糖-丙烯酰胺接枝共聚物的结构,同时试验了该接枝共聚物的絮凝性能。结果表明,该接枝共聚物的絮凝效果优于壳聚糖。

Using redox inducing system based on K2S2O8-NaHSO3 as initiator, chitosan-acrylamide graft copolymer was synthesized by free radical graft copolymerization. Several factors influencing on the graft ratio and graft efficiency, such as the concentration of K2S2O8 and NaHSO3 , the mass ratio of chitosan to acrylamide, reaction temperature and reaction time were studied. The optimum conditions were as follows ： c（ K2S2O8 ） = 3.0mmol/L, c（ NaHSO3 ） = 2.0mmol/L, m （chitosan） ： m（ AM ） = 1： 5, reaction temperature was 50℃ , and reaction time was 3.5h. The structure of graft copolymer was characterized by FTIR. At the same time, the flocculation property of this copolymer was also studied. The experiment results indicated that the effect of flocculation of this graft copolymer was better than that of chitosan.