▎ 摘　　要

Nanocomposite films of polybutylene succinate (PBS)/graphene nanoplatelets (GnP) with a GnP content ranging from 0 to 1.35 wt.% were prepared by melt processing. The morphology of both the neat PBS and PBS/GnP nanocomposites were investigated and revealed no significant impact of GnP on the crystalline microstructure. Moisture sorption at 10 degrees C, 25 degrees C, and 40 degrees C were analyzed and modeled using the Guggenheim, Andersen, and De Boer (GAB) equation and Zimm-Lundberg theory, allowing for a phenomenological analysis at the molecular scale. An understanding of the transport sorption properties was proposed by the determination of the molar heat of sorption (Delta H-s), and the activation energy of the diffusion (E-d) of water in the matrix since both solubility and diffusion are thermo-activable properties. Both Delta H-s and E-d showed a good correlation with the water clustering theory at high water activity. Water and dioxygen permeabilities (P-H2O and P-O2) were determined as a function of temperature and water activity. P-H2O and P-O2 decreased with the addition of a small amount of GnP, regardless of the studied temperature. Moreover, the evolution of P-H2O as a function of water activity was driven by the solubility process, whereas at a given water activity, P-H2O was driven by the diffusion process. Activation energies of the permeability (E-p) of water and dioxygen showed a dependency on the nature of the permeant molecule. Finally, from the Delta H-s, E-d, and E-p obtained values, the reduction in water permeability with the addition of a low content of GnP was attributed mainly to a tortuosity effect without diffusive interfaces rather than a significant change in the transport property mechanism.