Preparation and Property of Graphene/Polylactic Acid Composite

Using polylactic acid with two particle size (20, 125 μm) as substrate material, respectively, and graphene as reinforcing material, the graphene/polylactic acid composite powders were prepared by ball milling, then pressed to two graphene/polylactic acid composites at 150 ℃. The bending performance and conductivity of the composites were studied. The results show that the graphene was coated on the surface of polylactic acid particles to form composite particles under the combining effects of mechanical interlocking and electrostatic adsorption. With the increase of graphene content, the bending strength of the two composites first increased then decreased, and the conductivity increased first rapidly then gently, and achieved relatively good values using polylactic acid with relatively small particle size. But too much graphene resulted in the defects on the surface of composites, such as cracks and broken. With the increase of molding pressure, the conductivity of the composite increased slightly, but the bending strength changed not obviously.