| 초록 |
We employed various amorphous polymers such as polycarbonate, poly(methyl methacrylate), polystyrene, and poly(styrene-co-acrylonitrle) and MWCNTs to fabricate transparent, electrically conductive polymer/CNT hybrid films. In solution casting process, some films showed ring-shaped cells composed of MWCNTs. These cells were formed by Bernard-Marangoni instability during solvent evaporation. We found that the electrical conductivity of hybrid films strongly depends on the shape of Bnard-Marangoni cells. There may be two driving forces on the Bnard-Marangoni instability; surface tension gradient and buoyancy. The surface tension gradient is affected by temperature and concentration. All polymer/CNT hybrid films used in this study showed the lowest surface resistivity near the value of MaT 25 which is onset point of instability. In order to measure the MaC, we employed dynamic light scattering (DLS) to measure the cooperative diffusion coefficients of each polymer. |
