Artificial membranes from multiblock copolymers. 3. Preparation and characterization of charge-mosaic membranes

Miyaki, Yoshiyuki; Nagamatsu, Hiroshi; Iwata, Makoto; Ohkoshi, Koji; Se, Kazunori; Fujimoto, Teruo

doi:10.1021/ma00141a006

Cited by 62 publications

(43 citation statements)

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“…Charge mosaic is a different kind of charged membrane, which is still in a fundamental stage of development It constitutes a challenging opportunity for block copolymers. These membranes have alternating nanosize domains with opposite charges [9][10][11][12] . This gives them the capability of being more permeable for salt than for small neutral molecules 10,13,14 , as shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

“…Charge mosaic membranes were among the first reported block copolymer membranes 9, 10, 13-15 . Miyaki et al 9,15 prepared charge mosaic membranes from a pentablock copolymer, polyisoprene-b-polystyrene-b-polyisoprene-b-poly (4-vinylbenzyl) dimethylamine-bisoprene), with one block being quaternized, another sulfonated and one of the other blocks used for crosslinking. Analogous commercial pentablock copolymers (NEXAR ® ) have been recently rediscovered and explored, not as charge mosaic, but for other applications [16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

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Block Copolymer Membranes for Aqueous Solution Applications

2016

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Block copolymers are known for their intricate morphology. We review the state of the art of block copolymer membranes and discuss perspectives in this field. The main focus is on pore morphology tuning with a short introduction on non-porous membranes. The two main strategies for pore formation in block copolymer membranes are (i) film casting and selective block sacrifice and (ii) self-assembly and non-solvent induced phase separation (SNIPS). Different fundamental aspects involved in the manufacture of block copolymer membranes are considered, including factors affecting the equilibrium morphology in solid films, self-assembly of copolymer in solutions and macrophase separation by solvent-non-solvent exchange. Different mechanisms are proposed for different depths of the SNIPS membrane. Block copolymer membranes can be prepared with much narrower pore size distribution than homopolymer membranes. Open questions and indications of what we consider the next development steps are finally discussed. They include the synthesis and application of new copolymers and specific functionalization, adding characteristics to respond to stimuli and chemical environment, polymerization-induced phase separation, and the manufacture of organic-inorganic hybrids.3

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Block Copolymer Membranes for Aqueous Solution Applications

2016

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“…Charge-mosaic membranes were prepared from the benzene-cast films of the pentablock copolymers by introducing cation-exchange and anion-exchange groups into them: first, nitrogen atoms in the A parts were quaternized with methyl iodide vapor, next, the polydiene parts (D) were cross-linked with sulfur monochloride dissolved in nitromethane at a concentration of 20 vol %, and finally the S parts were sulfonated with chlorosulfonic acid dissolved in I ,2-dichloroethane at a concentration of 2 vol%. The details of the procedures were reported by Miyaki et al 6 …”

Section: Film Preparationmentioning

confidence: 99%

“…Temperature dependences of the dynamic Young's modulus E', loss modulus E", and tan 6 were measured with a Rheovibron DDV-11-C viscoelastic spectrometer (Toyo Baldwin Co.) at a fixed frequency of 10Hz. The temperature was increased from 120 to 370 Kat a rate of I K min.…”

Section: Viscoelastic Measurementsmentioning

confidence: 99%

“…4 -6 In practice, the resulting charge-mosaic membranes exhibited water and salt transport behaviors peculiar to a charge-mosaic membrane. 6 However, the ion-exchange layers of the membrane prepared were not perpendicular to the membrane surface throughout the membrane but randomly oriented and considerably winding, although this is inevitable to some extent because the layers are extremely thin compared with the thickness of the membrane. The well-defined morphology continuous over a long distance is essential for a charge-mosaic membrane of high separation efficiency.…”

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Artificial Membranes from Multiblock Copolymer IV. Four-Component Pentablock Copolymers of the DSD′AD Type Usable to Fabricate a Charge-Mosaic Membrane

Takahashi

Matsumura

Toda

et al. 1986

Polym J

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ABSTRACT:Four-component pen tab lock copolymers of the DSD 'AD type, poly(isoprene-bstyrene-b-bu tadiene-b-( 4-vin y I benzy I )dimeth y Jamine-b-isoprene) and poI y(bu tadiene-b-st yrene-bisoprene-b-(4-vinylbenzyl)dimethylamine-b-butadiene), were prepared by a sequential anionic polymerization and the morphologies of the films cast from benzene, dioxane, and cyclohexane solutions of the samples were studied by electron microscopy and viscoelastic spectrometry. Threelayer lamellar structures were observed for the benzene-and dioxane-cast films just like as the case for ISIAI pentablock copolymers. Charge-mosaic membranes prepared by quaternizing, crosslinking, and sulfonating the films exhibited better refined microstructures and better performance than those prepared from ISIAI block copolymers.KEY

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Anionic polymerization of secondary aminostyrene and characterization of the polymer

Se¹,

Kudoh²

1999

J. Appl. Polym. Sci.

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Preparation by anionic living technique and characterization of poly-(secondary aminostyrene) having narrow molecular weight distribution were investigated. N-isopropyl-N-trimethylsilyl-4-vinylbenzylamine (SBA) was purified by use of sec-butylmagnesium bromide as a purging reagent under high vacuum. SBA was anionically polymerized with n-butyllithium or cumylpotassium in tetrahydrofuran at Ϫ78°C under high vacuum to yield the corresponding polymer (PSBA) in 100% yield. Subsequent deprotection of the trimethylsilyl group from PSBA produced poly(N-isopropyl-4-vinylbenzylamine) (PBA) of the desired molecular weights (M n : 1.3 ϫ 10 4 -17 ϫ 10 4 , determined by membrane osmometry) with narrow molecular weight distribution (M w /M n : 1.07-1.03, determined by gel permeation chromatography). The living lithium carbanion of PSBA can initiate styrene (St) to yield PSBA-b-PSt block copolymer (M n ϭ 4.0 ϫ 10 4 , M w /M n ϭ 1.05), and the polystyryllithium can initiate SBA to yield PSt-b-PSBA (M n ϭ 3.7 ϫ 10 4 , M w /M n ϭ 1.25). The deprotection of the trimethylsilyl group from the two block copolymers produced new block copolymers containing poly(secondary aminostyrene) block. Anionic reactivity of SBA and basic properties of PSBA are discussed in terms of the 13 C chemical shift of ␤-carbon in the vinyl group of SBA and steric effect.

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Artificial membranes from multiblock copolymers. 3. Preparation and characterization of charge-mosaic membranes

Cited by 62 publications

References 13 publications

Block Copolymer Membranes for Aqueous Solution Applications

Block Copolymer Membranes for Aqueous Solution Applications

Artificial Membranes from Multiblock Copolymer IV. Four-Component Pentablock Copolymers of the DSD′AD Type Usable to Fabricate a Charge-Mosaic Membrane

Anionic polymerization of secondary aminostyrene and characterization of the polymer

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