Abstract:

Graft copolymerization of glycidyl methacrylate（GMA）onto cassava starch was carried out in emulsion with potassium persulfate as an initiator. Influence of reaction conditions on the percentage of grafting（G），grafting efficiency（GE）and epoxy value（EV）were investigated. Structure of the synthesized graft copolymers was characterized by TG-DSC. Results showed that graft copolymer with high values of G，GE and EV was obtained. The optimal conditions for the graft copolymerization were found as m(GMA)：m(starch)= 2 with initiator concentration of 6 mmol·L^－1 for 1h of reaction at 60 ℃，with which the G，GE and EV values of the obtained graft copolymer were 64.95%，95.57% and 4.24 mmol/g，respectively. It was proved that the thermal stability of the graft copolymer was better than cassava starch.

摘要：

以木薯淀粉为原料、过硫酸钾为引发剂，通过乳液聚合法制备淀粉甲基丙烯酸缩水甘油酯（GMA）接枝共聚物，系统考察了反应条件对接枝共聚物接枝率（G）、接枝效率（GE）以及环氧值（EV）的影响，并通过TG-DSC对接枝共聚物结构进行了表征。结果表明：在m(GMA)∶m(淀粉)=2，过硫酸钾浓度为6 mmol/L，反应温度60 ℃，反应时间1 h的条件下，可制得接枝率、接枝效率以及环氧值分别为：64.95%、95.57%、4.24 mmol/g的接枝共聚物；接枝共聚物热稳定性比原淀粉有所提高。