Abstract: In this paper, a new thermoplastic deacetylated konjac glucomannan（TDKGM)was synthesized by graft copolymerization of methyl acrylate（MA)and methyl methacrylate（MMA)onto konjac glucomannan（KGM).Melt blending of polycaprolactone（PCL)and TDKGM was performed to improve the processing and comprehensive mechanical properties of PCL and TKDGM. The blending of polycaprolactone（PCL)and TDKGM. was characterized with scanning electron microscope（SEM), differential scanning calorimetry（DSC), X-ray diffraction and thermal gravimetric analysis（TG), and Fourier transform infrared spectroscopy.The results showed that the presence of TDKGM in the blends played a role of nucleation agent, which increased the crystallization temperature in the blends.In addition, the thermal processing property of PCL/TDKGM blend（80/20)was quite close to low density polyethylene（LDPE), whose equilibrium torque, maximum torque and plasticizing time were 10.7 N·m, 48.7 N·m and 300 s, respectively.And the PCL/TDKGM blend（80/20)resulted in an even greater ductility with an elongation at break of 256.48%.PCL/TDKGM blends are expected to be a new potential biodegradable plastic.

Key words: thermoplastic konjac glucomannan, polycaprolactone, blends

摘要： 以资源丰富的天然可降解高分子材料魔芋葡甘聚糖(KGM)为原料, 以甲基丙烯酸甲酯和丙烯酸甲酯为单体，过硫酸铵为引发剂，合成了热塑性魔芋葡甘聚糖。将热塑性魔芋葡甘聚糖(TDKGM)和聚己内酯(PCL)熔融共混制备热塑性魔芋葡甘聚糖/聚己内酯共混物(TDKGM/PCL)。通过热重分析、扫描电镜、差示扫描量热仪(DSC)、XRD和万能力学试验机等对TDKGM/PCL共混物的结构和性能进行了分析表征。结果表明：共混物中热塑性魔芋葡甘聚糖对聚己内酯的结晶起到了成核剂的作用，使聚己内酯能在较高温度下开始结晶，并可明显提高共混物中聚己内酯相的结晶速度。TDKGM/PCL复合材料(20/80)的最大扭矩值为48.7 N·m，塑化时间在300 s以上，平衡扭矩在10.7 N·m，与PE相当接近，并且具有高达256.48%的断裂伸长率。

关键词: 热塑性魔芋葡甘聚糖, 聚己内酯, 共混物