Preparation and Properties of Carbon Nanotubes/Poly (Lactic Acid) Composites

Carbon nanotubes(CNTs)/poly(lactic acid) (PLA) composites were prepared by melt blending method. The morphology of spherulitic crystal and fracture was observed, and the crystallinity and the hydrolysis properties of CNTs/PLA composites with different ratios were studied. The results show that CNTs could act as heterogeneous nucleators and increase the crystallinity rate and degree of PLA, the crystallinity degree could reach 44.90% when CNTs content was 1wt%, and CNTs could disperse homogenously in matrix. The fracture took on mid-layer damage morphology when CNTs content was less than 1wt%, and the spherulitic crystal diameter of composite increased with the increase of CNTs content, CNTs could reduce the hydrolysis rate of PLA.