Topographic Templating of Islands and Holes in Highly Asymmetric Block Copolymer Films
| Autor: | Rachel A. Segalman, Edward J. Kramer, Kathleen Schaefer, Glenn H. Fredrickson, Sergei Magonov |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Macromolecules. 36:4498-4506 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | Asymmetric diblock copolymers with a spherical domain structure form islands or holes on the free surface of a thin film when the initial spun-cast film thickness does not match that of an integral number of layers of spheres plus a brush. When this film is cast on a substrate topologically patterned with rectangular, flat bottomed wells as deep as a layer of spheres, the edges of these wells act as sinks for excess material. As a result, we observe the movement of material away from the raised areas (mesas) toward the adjacent wells so that if a mesa surface initially contains holes exposing the underlying layer of spheres or brush, these holes will coalesce and grow until the top layer of spheres forms a bicontinuous structure with the holes, and finally this structure will break up into discrete islands. If the islands exist on top of only a brush layer, their shrinkage is limited by the detachment kinetics of a chain from the island into the brush. If the islands are on top of another layer of spheres... |
| Databáze: | OpenAIRE |
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