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
Hauptverfasser: Basutkar, Monali N, Majewski, Pawel W, Doerk, Gregory S, Toth, Kristof, Osuji, Chinedum O, Karim, Alamgir, Yager, Kevin G
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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.
ISSN:0024-9297
1520-5835
DOI:10.1021/acs.macromol.9b01703