2020
DOI: 10.1021/acs.macromol.0c01233
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Dewetting-Induced Alignment and Ordering of Cylindrical Mesophases in Thin Block Copolymer Films

Abstract: The fabrication of ordered self-assembled nanopatterns in block copolymer films, especially aligned nanostructures, has gained considerable attention. Here, we present a simple approach based on dewetting-induced alignment of cylindrical mesophases in thin polystyreneblock-poly(2-vinylpyridine) (PS-b-P2VP) films. In the course of dewetting enabled by solvent vapor annealing, cylinders aligned parallel to the dewetting contact line with the size of the ordered domain increasing in the direction normal to the de… Show more

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Cited by 7 publications
(10 citation statements)
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“…For example, Zhang et al showed that thermally annealed PS‐b‐P2VP films with cylinders, initially oriented perpendicular to the substrate, exhibit dewetting after SVA, with parallel cylinders near the dewetted regions. After SVA for 24 h, the parallel alignment propagates across the film, as the cylinders align with the moving contact line at the edge of a dewetted region 102 . Environmental AFM imaging offers the potential to image these annealing processes in situ, capturing the annealing dynamics and mechanisms in real time, as well as capturing the morphological changes that accompany deswelling of the polymer films.…”
Section: Polymer Applicationsmentioning
confidence: 99%
See 1 more Smart Citation
“…For example, Zhang et al showed that thermally annealed PS‐b‐P2VP films with cylinders, initially oriented perpendicular to the substrate, exhibit dewetting after SVA, with parallel cylinders near the dewetted regions. After SVA for 24 h, the parallel alignment propagates across the film, as the cylinders align with the moving contact line at the edge of a dewetted region 102 . Environmental AFM imaging offers the potential to image these annealing processes in situ, capturing the annealing dynamics and mechanisms in real time, as well as capturing the morphological changes that accompany deswelling of the polymer films.…”
Section: Polymer Applicationsmentioning
confidence: 99%
“…After SVA for 24 h, the parallel alignment propagates across the film, as the cylinders align with the moving contact line at the edge of a dewetted region. 102 Environmental AFM imaging offers the potential to image these annealing processes in situ, capturing the annealing dynamics and mechanisms in real time, as well as capturing the morphological changes that accompany deswelling of the polymer films. Takano et al recently demonstrated in situ AFM imaging within a sealed SVA chamber, enabling direct measurements of solvent-swollen films.…”
Section: Block Copolymer Self-assemblymentioning
confidence: 99%
“…29,38 The diffusion-limited dynamics of the polymer melt studied here limits long-range flow, and we expect that hydrodynamic currents only disrupt the bridge locally, where curvature is highest. 39 The combined contributions of Ostwald ripening and coalescence together yield anomalous power-law exponents that exceed the predicted rate for capillarity-driven growth alone. Because we visualize the real-space mechanism for each process, we can distinguish discrete merger events from continuous growth due to ripening.…”
Section: Resultsmentioning
confidence: 96%
“…This control over the terrace morphology offers the potential for selective, localized functionalization of BCP surfaces . Moreover, control over the evolution of the terrace topography can in turn be used to drive nanopattern ordering through flow-induced alignment . In each case, the mesoscale terrace architecture is intrinsically connected to thermodynamics of the nanoscale pattern.…”
Section: Resultsmentioning
confidence: 99%
“…The orientation was realized through a solvent vapor annealing (SVA) technique that has been proved to be an effective way to improve the ordering of BCPs to form highly oriented structures. [29][30][31] The synthesized BCP was poly(N-(bis(4 0 -((2-hexadecyl)oxy)-[1,1 0biphenyl]-4-yl)terephthalate-2-yl)-5-norbornene-2,3-dicarboximide)b-poly(N-(polyethylene glycol monomethyl ether hexanoate-6-yl)-5norbornene-2,3-dicarboximide) (tablet-b-bottlebrush; TB), as shown in Fig. 1.…”
Section: Introductionmentioning
confidence: 99%