The grafted poly(lactic acid)/thermoplastic starch blends with glycidyl methacrylate and thermoplastic starch addition were prepared by extrusion and injection molding technologies to improve the interfacial adhension of PLA/starch and lower the cost. Infrared spectrum analysis confirms that GMA has been successfully grafted onto the PLA. The mechanical properties

the thermal properties

the morphology of fractured composite surfaces and hydrophilic properties above were well-analyzed. The optimum results of tensile strength

elongation at break and elasticity modulus are 42.6MPa

8.9% and 260MPa respectively

which is explored at the mass of 6% GMA and 10% TPS (the grafting ratio is 1.51%). Compared with higher thermoplastic starch content in the blends

the FE-SEM observations show that the starch particles on the tensile fracture surface of lower thermoplastic starch content are better embedded in the matrix

resulting in the partial starch granules and a strong interfacial adhension obviously. DMA and DSC results show that T

g

storage modulus

crystallinity

crystalline temperature and melting temperature just change on a small scale with different mass ratio of PLA-g-6% GMA/TPS blends. The results of water absorption and contact angle values indicate that the blends of lower thermoplastic starch change less than those of higher thermoplastic starch.