Abstract
One-dimensional (1D) composite nanostructures, or vertically aligned composite nanostructures (VACNs), of polystyrene (PS) and graphene nanoplatelets (GNPs) (1.0-5.0 wt%) were precisely replicated by thermal nanoimprint with an anodic aluminum oxide (AAO) template. In this study, we fabricated VACNs of PS-GNPs (1.0-5.0 wt%) with a diameter of 100 nm and length of 10-70 μm, depending on the imprinting conditions. The obtained PS-GNPs 5.0 wt% VACNs showed enhancement of flat film water contact angle increasing from 87±3° to 132±2°. The nanostructures of PS-GNPs exhibit improved surface mechanical properties when compared with the neat PS. The evaluated surface mechanical properties included friction coefficient, surface durability, surface modulus, and hardness. The glass transition temperature (Tg) of PS-GNPs nanostructures increased about 1 to 4°C as compared with their bulk composites because of the immobilization the polymer chain owing to confinement in the AAO template and also due to the surface interfacial interaction effects between PS and GNPs. Moreover, the maximum thermal conduction of 1D PS-GNPs 5.0 wt% nanostructures were obtained with a value up to 1.8 W/m.K due to the control of filler orientation. The PS-GNPs nanostructures showed a higher thermal stability than that the PS nanostructures.
Published Version
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