Abstract:

In this paper, a solution blending method was selected to prepare graphene-polyvinyl chloride composites with different mass fractions （0%, 2%, 4%, 6%） of graphene. The mechanical properties and microscopic morphology, electrical conductivity and thermal weight loss of the composites were analyzed. It is found that with the increase of graphene content, the tensile strength and hardness of graphene-polyvinyl chloride composite materials gradually increase. When the graphene content is 4wt%, the tensile strength and the hardness reach the maximum values of 25.8 MPa and 49.2°, respectively. The conductivity analysis reveals that the conductivity of the graphene-polyvinyl chloride composite material increases exponentially with the increase of graphene content, reaching its maximum value at a graphene content of 6wt%. The SEM analysis shows that there are many gaps in the section and matrix of pure PVC. After the introduction of graphene, the fracture is gradually refined and a lamellar structure appears. The PVC molecules are effectively attached to the surface. The analysis shows that with the increase of graphene content, the thermal stability of the graphene-polyvinyl chloride composite material is significantly improved, and the carbon residue increases with the increase of graphene content at 500 ℃, reaching 48.3% at a graphene content of 6wt%.

Key words: graphene, polyvinyl chloride, solution blending method, mechanical properties, thermal stability