| 초록 |
Block copolymer can self-assemble into a rich variety of morphologies in selective solvent, typically forming spherical micelles, cylindrical micelles, or vesicles. In this work we report observation of donut-shaped (ring-like) micelles which are rarely found in organic solvents. The donut-shaped crew-cut micelles are prepared with polyisoprene-block-poly(2-vinylpyridine) (PI-b-P2VP) diblock copolymer in THF and ethanol binary solvent mixtures. PI blocks aggregate to form a soft core with P2VP block as the corona. Due to the low Tg of core forming PI block it would allow the micelles to reorganize readily in response to the environmental changes such as the change in selective solvent content. The donut-shaped micelles produced here are stable and exhibits high uniformity in shape and size as the ethanol content increases, which probably originated from the rearrangement of vesicular structures. |
