Study on Structure and Performance of PLA/ZnO Nanocomposites
Hydrophobic nano-ZnO(s)and pure nano-ZnO(u)were melt blended with polylactic acid(PLA)through a twin-screw extruder to obtain PLA/ZnO nanocomposites.The effects of surface activity and addition amount of nano-ZnO on the properties of PLA/ZnO nanocomposites were investigated.The results show that the comprehensive properties of PLA/ZnO(s)nanocomposites prepared by surface treated nano-ZnO(s)are better than those of PLA/ZnO(u)nanocomposites.Nano-ZnO has a catalytic effect on the thermal degradation of PLA molecular chains under high temperature conditions.When the amount of nano-ZnO is continuously increased,the crystallization ability and mechanical properties of PLA/ZnO(s)and PLA/ZnO(u)nanocomposites are continuously decreased.The surface-treated nano-ZnO(s)will inhibit the depolymerization reaction of PLA molecular chain and the occurrence of intermolecular transesterification reaction at high temperature.When the amount of nano-ZnO is the same,PLA/ZnO(s)nanocomposites have higher crystallization ability and better mechanical properties.When the addition amount of nano-ZnO is 1 phr,the impact strength of PLA/ZnO(s)-1 nanocomposite reaches 5 533.8 J/m2 and the tensile strength reaches 64.0 MPa,which are higher than the impact strength(4 711.0 J/m2)and tensile strength(58.1 MPa)of PLA/ZnO(u)-1 nanocomposite.
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