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.