Bicontinuous Network Nanostructure with Tunable Thickness Formed on Asymmetric Triblock Terpolymer Thick Films

Aissou, Karim; Mumtaz, M.; Bouzit, Hana; Pécastaings, Gilles; Portale, Giuseppe; Fleury, Guillaume; Hadziioannou, Georges

doi:10.1021/acs.macromol.9b00572

Cited by 10 publications

(26 citation statements)

References 42 publications

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“…Note that differences between the bulk and thin film morphologies have also been observed for both DSV 25 and DSM 43 samples.…”

Section: Resultsmentioning

confidence: 69%

“…[7][8][9][10][11][12][13][14] Compared with diblock copolymers, triblock and multiblock polymers can produce nanostructures with greater structural diversity and additional chemical functionalities, [15][16][17][18][19][20] and there has been an increasing emphasis on understanding their selfassembly and 3D morphologies. [21][22][23][24][25] However, it is challenging to resolve the morphologies of 3D BCPs comprising more than two polymeric components unless there is good contrast between the microdomains, for example a contrast in density, chemical composition, or reactivity. Block-selective etching followed by planview or cross-sectional imaging using scanning electron microscopy (SEM) is commonly used to characterize BCP morphologies, but the organic blocks are often difficult to distinguish.…”

Section: Introductionmentioning

confidence: 99%

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Resolving Triblock Terpolymer Morphologies by Vapor-Phase Infiltration

et al. 2020

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“…Note that differences between the bulk and thin film morphologies have also been observed for both DSV 25 and DSM 43 samples.…”

Section: Resultsmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Resolving Triblock Terpolymer Morphologies by Vapor-Phase Infiltration

et al. 2020

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“…Figure e confirms the formation of a PL structure on the top surface layer since PS (bright) perforations are evident through the PDMSB (dark) lamellae. A perforated lamellar structure with core–shell perforations arranged into a rhombic array has been recently achieved on the skin layer of solvent-annealed (CHCl 3 ) PDMSB- b -PS- b -P2VP thick films . For such PL structure having perforations stacked in ABAB··· sequence, the (001) and (101) planes were also the most frequently observed at the material–air interface.…”

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confidence: 99%

Periodic Bicontinuous Structures Formed on the Top Surface of Asymmetric Triblock Terpolymer Thick Films

et al. 2019

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The combination of the nonsolvent-induced phase separation (NIPS) process with a solvent vapor annealing (SVA) treatment is used to produce asymmetric and hydrophobic thick films having different long-range ordered network nanostructures, which are inaccessible via currently available membrane fabrication methods. We show that the disordered phase generated by NIPS on the material top surface can be transformed into a highly ordered bicontinuous network nanostructure during the SVA process without disrupting the substructure morphology. For instance, by using a straightforward blending approach, either a triply periodic alternating diamond (D A ) structure or a core−shell perforated lamellar (PL) phase was demonstrated on the skin layer of fully hydrophobic poly(1,1-dimethyl silacyclobutane)-block-polystyrene-blockpoly(methyl methacrylate) (PDMSB-b-PS-b-PMMA) thick films. Such a material fabrication method, enabling the formation of a sponge-like substructure topped by a network phase having an excellent long-range order, provides an appealing strategy to facilitate the manufacture of next-generation membranes at large scale since these bicontinuous morphologies obviate the need of the nanochannel alignment.

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“…It is noteworthy that the transformation of an asymmetric poly(1,1-dimethyl silacyclobutane)-b-PS-b-P2VP thick film, consisting of spongelike substructure topped by a few hundred nanometer thick perforated lamellar (PL) structure, into an entirely PL-structured monolith has been recently reported in the literature by increasing the SVA treatment duration, but no flux performance results were provided. [26] Here, to study the effect of the asymmetric material-tomonolith transformation on the material flux performances, the water permeability of several PS-b-P2VP-b-PEO/hPS thick films exposed to a CHCl 3 vapor during different times has been plotted as a function of water pressure applied from 0.5 to 1.5 bar, using a dead-end stirred ultrafiltration cell (see Figure 5). Regardless of the SVA treatment duration, all PS-b-P2VP-b-PEO/hPS thick films deposited on a porous (0.1 μm) hydrophilic PVDF support demonstrated an excellent stability over material failure at high feed pressure, as witnessed by a linear change in water flux with the increase in pressure drop.…”

Section: Resultsmentioning

confidence: 99%

Asymmetric Solvent‐Annealed Triblock Terpolymer Thick Films Topped by a Hexagonal Perforated Lamellar Nanostructure

Aissou

Bouzit

Krusch

et al. 2021

Macromol. Rapid Commun.

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Asymmetric and nanostructured polystyrene-block-poly(2-vinyl pyridine)-block-poly(ethylene oxide) (PS-b-P2VP-b-PEO or SVEO, S:V:EO ≈ 56:34:10, 79.5 kg mol -1 ) thick films blended with 20 wt% of a short PS homopolymer (hPS, 10.5 kg mol -1 ) are achieved by combining the non-solvent induced phase separation (NIPS) process with a solvent vapor annealing (SVA) treatment. Here, the NIPS step allows for the formation of a highly-permeable sponge-like substructure topped by a dense thin layer exhibiting poorly-ordered nanopores while the subsequent SVA treatment enables to reconstruct the material top surface into a porous monolayer of well-ordered hexagonal perforated lamellae (HPL). This optimized film architecture generated by NIPS-SVA shows a water permeability of 860 L h -1 m -2 bar -1 , which is roughly two times higher than the flux measured through NIPS made PS-b-P2VP-b-PEO/hPS materials having poorly-ordered nanopores. The post-SVA treatment is also revealed as a powerful tool to tailor the thickness of the nanostructure formed within the blended material because monoliths entirely composed of a HPL phase are produced by increasing the time of exposure to a chloroform stream. The water flux of such PS-b-P2VP-b-PEO/hPS monoliths is found to be an order of magnitude lower than that of their asymmetric film homologues.

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Bicontinuous Network Nanostructure with Tunable Thickness Formed on Asymmetric Triblock Terpolymer Thick Films

Cited by 10 publications

References 42 publications

Resolving Triblock Terpolymer Morphologies by Vapor-Phase Infiltration

Resolving Triblock Terpolymer Morphologies by Vapor-Phase Infiltration

Periodic Bicontinuous Structures Formed on the Top Surface of Asymmetric Triblock Terpolymer Thick Films

Asymmetric Solvent‐Annealed Triblock Terpolymer Thick Films Topped by a Hexagonal Perforated Lamellar Nanostructure

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