Mechanisms of drying of graphene/poly (amide imide) solutions for films with enhanced gas barrier and mechanical as investigated by real time measurement system

摘要: The drying behavior of polyamide-imide (PAI)/graphene-oxide nanosheets (GO) in dimethylacetamide (DMAc) with and associated anisotropy development were determined using a real-time measurement system that tracks weight loss, thickness, out plane birefringence. Initially optically isotropic cast films develop optical at critical solvent concentration. For PAI/DMAc solution the decrease initial casting thickness lead to earlier onset birefringence caused primarily by increased depletion rate solvent. Addition GO content resulted evaporation reduction hygroscopicity DMAc presence as shown contact angle measurements. Planar orientation excellent helium-barrier properties even very small concentrations.