Abstract
We use functionalized graphene sheets to enhance the PMMA properties, and utilize solution mixing method to prepare the graphene/PMMA nanocomposites. We investigate the mechanical and thermal properties and try to explain the probable mechanism between graphene sheets and PMMA matrix. The interaction between solvent and PMMA has been studied for several years. We use Harmon model to fit the mass transport of methanol in PMMA and graphene/PMMA nanocomposites. The characteristic parameters of diffusion coefficient (D) and velocity (v) are calculated from the data of curve fitting, and the results satisfy Arrhenius equation. Moreover, we study the crack healing behavior of PMMA and graphene/PMMA nanocomposites in methanol, because this phenomenon only occurs when the operating temperature is higher than the effective glass transition temperature, and we confirm that the activation energy of crack healing is also related to the diffusion coefficient (D) in mass transport.