| 초록 |
Polymer/graphene composites have been used for improved thermal, mechanical and electrical properties, but it is difficult to improve these properties in thickness direction of films because fillers should be aligned to the common processing direction. In this study, we used the directional cooling crystallization method as a fabrication process for the polymer matrix having thickness-through pores. Using this technique and combine with a wetting method, we could produce polyurethane/graphene composite films by adsorption of graphene on the wall surface of vertically connected pores. The key advantage of this method is that only a small amount of filler is needed to improve thermal, electrical conductivities in thickness direction of films (less than 1 wt %). Therefore, controlling the matrix pore morphology and the loading amount of filler can widen the applicability of this process for preparation of pressure sensitive films in vertical direction. |
