| 초록 |
Carbon-based nanofiller composites have widely been used for achieving improved thermal, mechanical and electrical properties, but it is often difficult to achieve proper properties along a desired direction because fillers are commonly aligned to the processing direction. In here, we used a directional cooling crystallization method as a fabrication process of PU matrix with thickness-through pores. Highly aligned pores were then used for the impregnation of nanofillers. After a subsequent impregnation method using the adsorption of graphene sheets on the wall surfaces of aligned pores, we could produce anisotropic graphene/polyurethane composite materials. Through this process, we can control the directionality of advanced electrical properties in the aligned pore direction of matrix because the major electron pathway was successfully aligned following the pore direction with the coated graphene on the pore wall, while pores are playing a role of blocking electron transfer. |
