The effect of wood contents on the properties of wood flour/esterified starch/PLA composites

In this work,wood flour/esterified starch/PLA composites were prepared by melt extrusion method with wood flour,maleic anhydride esterified starch and poly(lactic acid)as raw material,glycerol as compatibilizer.In order to study the effect of wood contents on the interfacial compatibility,XRD and SEM were used to analysis the crystal degree and fracture morphology.Thermal stability,mechanical properties,rheological properties and water absorption rate of composites were also characterized.The results showed that with the increasing of wood contents,the interfacial compatibility of composites decreased obviously,tensile strength and bending strength increased,elongation at break reduced gradually,and the water absorption rate increased observably.TGA curves indicated that with wood contents increased,the thermal stability reduced.The rheological properties were also influenced by wood contents of the composites,as the addition amounts of wood flour increased,the storage modulus and complex viscosity gradually increased.