Abstract:
Glycidyl methacrylate grafted poly(ethylene)-
co-(vinyl acetate)(GEVA) and maleated thermoplastic starch(MST) were prepared,and their structures were characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR).Composites of poly(lactic acid)(PLA)/MST/GEVA were prepared by melt blending.The mass fraction of MST and GEVA in the composites was fixed at 20%.The properties of the PLA/MST/GEVA composites were investigated by tensile strength,impact strength,scanning electron microscope (SEM) and differential scanning calorimeter (DSC).The results showed that the addition of GEVA remarkably improved the toughness of the composites,the elongation at break of the composites could reach 170% and the impact strength increased by about four times;With the increase of graft ratio of GEVA,starch granules were gradually coated by GEVA,and the dispersion of starch granules in PLA matrix were improved.In addition,the water absorption of the composites decreased,and the crystallization of the composites reduced.