Composite gas-separating membranes with polymerized LB films

Maximychev, Alexander V.; Matyukhin, Vladimir D.; Stepina, N. D.; Yanusova, L. G.

doi:10.1016/s0040-6090(95)08465-7

Cited by 11 publications

(5 citation statements)

References 12 publications

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“…One of the most fascinating properties of block copolymers is their ability to self-assemble into ordered nanostructures not only in selective solvent and melts − but also at the interface and surface. − Self-assembly of amphiphilic or surface-adsorbing block copolymers at the air−water interface can form two-dimensional monolayers on the nanometer scale order. The monolayer films at the interface can be transferred to a solid substrate using the Langmuir−Blodgett (LB) transfer technique, which provides prospective application in electrooptical materials, nanopatterned substrates for microlithography, and separation membranes …”

Section: Introductionmentioning

confidence: 99%

“…The monolayer films at the interface can be transferred to a solid substrate using the Langmuir-Blodgett (LB) transfer technique, which provides prospective application in electrooptical materials, 10 nanopatterned substrates for microlithography, 11 and separation membranes. 12 A variety of studies on LB monolayer of amphiphilic block copolymers give rise to two-dimensional surface aggregates that range from small circular objects to cylindrical structures and to large planar aggregates. 13,14 The polymorphism depends not solely on the absolute size of each block but rather relies on a more subtle balance between the relative sizes of the two blocks in a fashion more complicated than that observed for block copolymers in solution and in bulk.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Reorganization of Rod−Coil Diblock Copolymers at the Air−Water Interface

et al. 2006

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Amphiphilic rod-coil diblock copolymers consisting of flexible poly(ethylene oxide) (PEO) and rodlike poly{(+)-2,5-bis[4'-((S)-2-methylbutoxy)phenyl]styrene} (PMBPS) with predominant hydrophobic contents formed ordered monolayers at the air-water interface. The structures of monolayers transferred to a mica substrate at different surface pressures by the Langmuir-Blodgett method were investigated by atom force microscopy (AFM). For PEO(104)-b-PMBPS(17) copolymer (the subscripts denote the number-averaged polymerization degree of each block), a complete spectrum of molecular reorganization at variable surface pressures was observed. Spherical surface aggregates of LB monolayers were spontaneously formed during the solvent evaporation after the deposition of polymer solution. Continuous compression led to the pancake-to-brush conformation transition of the copolymer that PEO chains desorbed from the air-water interface and went into the water subphase. The effective content of the rod block changed continuously from 61% at zero pressure to 93% at the start of the monolayer collapse, igniting the molecular reorganization. As a result, coalescence of individual spherical aggregates into long cylindrical aggregates with an increase of the surface pressure was observed. For a series of block copolymers PEO(104)-b-PMBPS(m)() (m = 17, 30, 45, 53), as the rod contents increased from 61% to 83%, the morphological transition from spherical aggregates to long cylindrical aggregates in orientational order developed at zero pressure, which showed a similar dependence on the effective contents of the rod block to PEO(104)-b-PMBPS(17) at different pressures. In comparison to coil-coil block copolymers PEO-b-PS, the rod-coil block copolymers PEO-b-PMBPS exhibited distinct structure reorganization behavior, in which the orientation of rod block might play an important role.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular Reorganization of Rod−Coil Diblock Copolymers at the Air−Water Interface

et al. 2006

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“…More generally, the highly stratified and internally contrasting nature of these films may impart them with unique, anisotropic, and controllable properties, including, and especially, permeability. Indeed, one potential application of LB films is in membranebased separations (4,5).…”

Section: Introductionmentioning

confidence: 99%

The Directional Dependence of Water Penetration into Langmuir–Blodgett Multilayers

Girard

Quinn

Vanderlick

1999

Journal of Colloid and Interface Science

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“…Beltsios and co-workers , deposited LB layers of different oligomeric and polymeric precursors, such as sesquioxanes or fatty acid salts, on macroporous ceramic supports and treated the combined systems with plasma. , The latter were tested for gas and vapor separations. Maximychev and co-workers used LB films of diacetylene deposited on poly(dimethylsiloxane) membrane in order to form a gas-separating membrane selective to O 2 and He. Yet, film deposition on porous macroporous membrane often suffers from cracked skin layer − and the transition between the skin and the macroporous structure is not gradual.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Mono- and Multilayer Films of Polymerizable 1,2-Polybutadiene Using the Langmuir–Blodgett Technique

et al. 2011

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The essence of this study is to apply the Langmuir-Blodgett (LB) technique for assembling asymmetric membranes. Accordingly, Langmuir films of a (further) polymerizable polymer, 1,2-polybutadiene (1,2-pbd), were studied and transferred onto different solid supports, such as gold, indium tin oxide (ITO), and silicon. The layers were characterized both at the air/water interface as well as on different substrates using numerous methods including cyclic voltammetry, impedance spectroscopy, spectroscopic ellipsometry, atomic force microscopy, X-ray photoelectron spectroscopy, and reflection-absorption Fourier transform infrared spectroscopy. The Langmuir films were stable at the air-water interface as long as they were not exposed to UV irradiation. The LB films formed disorganized layers, which gradually blocked the permeation of different species with increasing the number of deposited layers. The thickness was ca. 4-7 Å per layer. Irradiating the Langmuir films caused their cross-linking at the air-water interface. Furthermore, we took advantage of the reactivity of the double bond of the LB films on the solid supports and graft polymerized acrylic acid on top of the 1,2-pbd layers. This approach is the basis of the formation of an asymmetric membrane that requires different porosity on both of its sides.

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Composite gas-separating membranes with polymerized LB films

Cited by 11 publications

References 12 publications

Molecular Reorganization of Rod−Coil Diblock Copolymers at the Air−Water Interface

Molecular Reorganization of Rod−Coil Diblock Copolymers at the Air−Water Interface

The Directional Dependence of Water Penetration into Langmuir–Blodgett Multilayers

Preparation and Characterization of Mono- and Multilayer Films of Polymerizable 1,2-Polybutadiene Using the Langmuir–Blodgett Technique

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