▎ 摘　　要

Thermal conductivity (k) of polymers is usually limited to low values of similar to 0.5 Wm(-1)K(-1)in comparison to metals (>20 Wm(-1)K(-1)). (100)(T3)//(926)(T4)The goal of this work is to enhance thermal conductivity (k) of polyethylene-graphene nanocomposites through simultaneous alignment of polyethylene (PE) lamellae and graphene nanoplatelets (GnP). Alignment is achieved through the application of strain. Measured values are compared with predictions from effective medium theory. A twin conical screw micro compounder is used to prepare polyethylene-graphene nanoplatelet (PE-GnP) composites. Enhancement inkvalue is studied for two different compositions with GnP content of 9 wt% and 13 wt% and for applied strains ranging from 0% to 300%. Aligned PE-GnP composites with 13 wt% GnP displays similar to 1000% enhancement inkat an applied strain of 300%, relative tokof pristine unstrained polymer. Laser Scanning Confocal Microscopy (LSCM) is used to quantitatively characterize the alignment of GnP flakes in strained composites; this measured orientation is used as an input for effective medium predictions. These results have important implications for thermal management applications.