Abstract: A novel material，thermoplastic konjac glucomannan (TKGM) was synthesized from KGM，vinyl acetate(VAc) for the first time in this research. This novel material is water resistant and degradable. The influence of different experimental conditions on the graft copolymerization was studied，and the optimal conditions were as follows：ammonium persulfate initiator concentration 12 mmol/L reaction time 3 h，reaction temperature 70 ℃，vinyl acetate concentration 0.52 mol/L. The structure and properties of TKGM were characterized with FTIR，DSC and torque rheometer. The results indicated that graft copolymerization reaction took place between KGM and VAc. The glass transition temperature (Tg) of TKGM was only 0.12 ℃，and there was a melting endothermic peak at about 165 ℃. The maximum torque was only 0.85 N·m，the plasticizing time was 44 s and the balance torque was only 4 N·m. These showed that the TKGM had a good plasticity processability.

摘要： 首次采用乙酸乙烯酯对魔芋葡甘聚糖（KGM）进行改性，合成了不溶于水的可降解性KGM热塑新材料。研究了不同工艺条件对KGM接枝共聚的影响，在引发剂浓度12 mmol/L、反应温度70 ℃、反应时间3 h、单体浓度0.52 mol/L条件下，KGM的接枝率和接枝效率较高。采用FTIR、DSC、转矩流变仪等对改性材料的结构和性能进行了分析表征。结果表明：KGM和乙酸乙烯酯之间发生了接枝共聚反应；改性材料的玻璃化转变温度仅为0.12 ℃，在165 ℃处出现了熔融吸热峰，具有较好的热塑性；最大扭矩仅为8.5 N·m，塑化时间44 s，平衡扭矩仅4 N·m，说明改性材料具有很好的热塑加工性能。