| 초록 |
In a solvent vapor annealing (SVA) process, block copolymer films are exposed to solvent vapor at a temperature below the bulk Tg of polymers. Swelling of polymers with a solvent provides with mobility for polymer chains to reorganize to a nanostructure. However, the developed morphology at the swollen state should change when it is dried back to the bulk state. Therefore, SVA is a more complicated process than thermal annealing and despite its widely use, the detailed morphology developmental process is not well understood. In this study, we investigated the swelling and microstructure development behavior of block copolymer films at different temperature in SVA. We found that higher temperature assists the development of the ordered microstructure in SVA at lower swelling ratio. This phenomenon is a positive aspect in SVA because the volume change during the drying process is reduced, that may adversely affect on the ordering of the microstructure in the final bulk morphology. |
