Aligned Morphologies in Near-Edge Regions of Block Copolymer Thin Films
We report a generic phenomenon in the ordering of block copolymer thin films, wherein the morphology spontaneously antialigns with respect to film discontinuities during thermal annealing. The aligned near-edge region propagates further from the edge with increased annealing time and temperature, wh...
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Veröffentlicht in: | Macromolecules 2019-10, Vol.52 (19), p.7224-7233 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We report a generic phenomenon in the ordering of block copolymer thin films, wherein the morphology spontaneously antialigns with respect to film discontinuities during thermal annealing. The aligned near-edge region propagates further from the edge with increased annealing time and temperature, while also being responsive to heating rate and applied stress fields. This effect is ascribed to a combination energetic preference for morphological orientation at boundaries as well as stress relaxation of the polymer film as it creeps orthogonal to film edges. |
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ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/acs.macromol.9b01703 |