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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。
The graft copolymerization of chitosan and acrylamide was carried out by graft copolymerization using K2S2O8-NaHSO3 redox initiator as initiator. The chitosan-acrylamide graft copolymer was synthesized by free radical graft copolymerization. The effects of K2S2O8 concentration, NaHSO3 concentration, mass ratio of chitosan to acrylamide, reaction temperature and reaction time on grafting yield and grafting efficiency were studied. The most suitable reaction conditions are as follows: c (K2S2O8) = 3.0mmol / L, c (NaHSO3) = 2.0mmol / L, m (chitosan) Time 3.5h. The structure of the chitosan-acrylamide graft copolymer was characterized by FTIR, and the flocculation performance of the graft copolymer was tested. The results show that the graft copolymer flocculation better than chitosan.