2020
DOI: 10.1021/acs.macromol.0c02026
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Large-Grained Cylindrical Block Copolymer Morphologies by One-Step Room-Temperature Casting

Abstract: We report a facile method of ordering block copolymer (BCP) morphologies in which the conventional two-step casting and annealing steps are replaced by a single-step process where microphase separation and grain coarsening are seamlessly integrated within the casting protocol. This is achieved by slowing down solvent evaporation during casting by introducing a nonvolatile solvent into the BCP casting solution that effectively prolongs the duration of the grain-growth phase. We demonstrate the utility of this s… Show more

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Cited by 8 publications
(25 citation statements)
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“…74,92 Three notable variations on this theme have produced well-ordered BP thin films: nonvolatile solvent vapor annealing, 92 plasticizer assisted solvent annealing, and solvent evaporation annealing. 74 In contrast to fast evaporation from typical solvents used for film casting (e.g., toluene, ∼1000 nm/s), the drying rates for the nonvolatile solvents vary from <0.1 to ∼4 nm/s. 74 The relatively long drying times for these nonvolatile solvents enable BPs to develop their nanostructure without the need for an enclosure.…”
Section: Methods To Manipulate Nanostructurementioning
confidence: 99%
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“…74,92 Three notable variations on this theme have produced well-ordered BP thin films: nonvolatile solvent vapor annealing, 92 plasticizer assisted solvent annealing, and solvent evaporation annealing. 74 In contrast to fast evaporation from typical solvents used for film casting (e.g., toluene, ∼1000 nm/s), the drying rates for the nonvolatile solvents vary from <0.1 to ∼4 nm/s. 74 The relatively long drying times for these nonvolatile solvents enable BPs to develop their nanostructure without the need for an enclosure.…”
Section: Methods To Manipulate Nanostructurementioning
confidence: 99%
“…As opposed to reintroducing solvent into a thin film, it also is possible to cast BPs from a mixture of volatile and nonvolatile solvents to slow the evaporation so the thin-film nanostructure can develop (Figure b,c). , Three notable variations on this theme have produced well-ordered BP thin films: nonvolatile solvent vapor annealing, plasticizer assisted solvent annealing, and solvent evaporation annealing . In contrast to fast evaporation from typical solvents used for film casting (e.g., toluene, ∼1000 nm/s), the drying rates for the nonvolatile solvents vary from <0.1 to ∼4 nm/s . The relatively long drying times for these nonvolatile solvents enable BPs to develop their nanostructure without the need for an enclosure.…”
Section: Methods To Manipulate Nanostructurementioning
confidence: 99%
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“…147 Copyright 2019 American Chemical Society, (f-h) adapted with permission from Macromolecules, 53, 11178. 40 Copyright 2020 American Chemical Society.…”
Section: Simultaneous Casting and Annealing Methodsmentioning
confidence: 99%
“…Several methodologies introduced in the previous content can be performed on an industrial-scale R2R processing line such as zone annealing and direct immersion annealing. [96,97,369,537,538] Other methods such as raster annealing also show some promises as an inexpensive approach with potentially compatible production rate. [276,539] However, these methods could sometimes suffer from a long processing time for aligning BCP nanostructures (at least hours) since typical workflow of many applications could require multiple processing steps to be finished within minutes.…”
Section: Scalabilitymentioning
confidence: 99%