Polyacrylonitrile-containing amphiphilic block copolymers: self-assembly and porous membrane formation

Gemmer, Lea; Niebuur, Bart-Jan; Dietz, Christian; Rauber, Daniel; Plank, Martina; Frieß, Florian V.; Presser, Volker; Stark, Robert W.; Kraus, Tobias; Gallei, Markus

doi:10.1039/d3py00836c

Cited by 5 publications

(2 citation statements)

References 89 publications

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“…For instance, Gemmer et al synthesized a novel diblock copolymer containing the polyacrylonitrile segment confined to a matrix-forming block, finding that mechanical properties of the resulting membrane improved significantly. 5 Meanwhile, Shu et al synthesized a new block copolymer containing the phenylboronic moiety confined to the pore phase, observing that prepared isoporous membranes displayed enhanced mechanical strength by the formation of cross-linking after thermal treatment. 6 Different from the modifications of hydrophilic or hydrophobic segment properties in diblock copolymers, Phillip et al synthesized a novel ABC triblock copolymer by connecting the poly-(isoprene) (PI) segment to PS-b-P4VP to have the PI-b-PSb-P4VP copolymer.…”

Section: Introductionmentioning

confidence: 99%

“…Although many advantages have been observed, isoporous diblock copolymer membranes usually show poor mechanical properties and low toughness, which remains as the great challenge for their durable applications. , In previous publications, polymer design has been developed as an effective way to improve the strength for isoporous membranes produced from diblock copolymers. For instance, Gemmer et al synthesized a novel diblock copolymer containing the polyacrylonitrile segment confined to a matrix-forming block, finding that mechanical properties of the resulting membrane improved significantly . Meanwhile, Shu et al synthesized a new block copolymer containing the phenylboronic moiety confined to the pore phase, observing that prepared isoporous membranes displayed enhanced mechanical strength by the formation of cross-linking after thermal treatment .…”

Section: Introductionmentioning

confidence: 99%

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Isoporous Membranes by the Symmetric Triblock Copolymer: A Strategy to Improve the Mechanical Strength without Sharply Changing the Pore Size and Permselectivity

Wu,

Wang,

Yin

et al. 2024

ACS Appl. Mater. Interfaces

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Isoporous membranes produced from diblock copolymers commonly display a poor mechanical property that shows many negative impacts on their separation application. It is theoretically predicted that dense films produced from symmetric triblock copolymers show much stronger mechanical properties than those of homologous diblock copolymers. However, to the best of our knowledge, symmetric triblock copolymers have rarely been fabricated into isoporous membranes before, and a full understanding of separation as well as mechanical properties of membranes prepared from triblock copolymers and homologous diblock copolymers has not been conducted, either. In this work, a cleavable symmetric triblock copolymer with polystyrene as the side block and poly(4-vinylpyridine) (P4VP) as the middle block was synthesized and designed by the RAFT polymerization using the symmetric chain transfer agent, which located at the center of polymer chains and could be removed to produce homologous diblock copolymers with half-length while having the same composition as that found in triblock copolymers. The self-assembly of these two copolymers in thin films and casting solutions was first investigated, observing that they displayed similar self-organized structures under these two conditions. When fabricated into isoporous membranes, they showed similar pore sizes (5−7% difference) and comparable rejection performance (∼10% difference). However, isoporous membranes produced from triblock copolymers showed significantly improved mechanical strength and higher toughness (2−10 times larger) as evidenced by the compacting resistance, strain−stress determination, and nanoindentation testing, suggesting the unique and novel structure− performance relationship in the isoporous membranes produced from symmetric triblock copolymers. The above finding will guide the way to fabricate mechanically robust isoporous membranes without notably changing the separation performance from rarely used symmetric triblock copolymers, which can be synthesized by the controlled polymerization as facilely as that found for diblock copolymers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Isoporous Membranes by the Symmetric Triblock Copolymer: A Strategy to Improve the Mechanical Strength without Sharply Changing the Pore Size and Permselectivity

Wu,

Wang,

Yin

et al. 2024

ACS Appl. Mater. Interfaces

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Multicompartment microparticles of SBM triblock terpolymers: Morphological transitions through homopolymer blending

Trömer,

Nikoubashman,

Gröschel

2024

Colloid Polym Sci

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Block copolymers (BCPs) have recently been explored in spherical confinement to form internally structured microparticles. While the behavior of AB diblock copolymers in confinement is comparably well studied, knowledge on confined ABC triblock terpolymers is still rather sparse. The latter are especially interesting as the third block allows the formation of a broader variety of multicompartment microparticles (MMs), but their synthesis is often realized through sequential polymerization, which can be work intensive and challenging. Here, we demonstrate that blending linear ABC triblock terpolymers with homopolymers is a versatile and straightforward method to tune the microphase behavior in MMs. We systematically blend polystyrene-block-polybutadiene-block-poly(methyl methacrylate) (SBM or PS-b-PB-b-PM) with homopolymers of hPS, hPB, or hPM, to study the feasibility of this approach to replicate specific morphologies or access new ones. We utilize Shirasu Porous Glass (SPG) membrane emulsification and evaporation-induced confinement assembly (EICA) to produce narrowly size-dispersed MMs with defined inner structure. We analyze the MMs with dynamic light scattering (DLS), as well as transmission and scanning electron microscopy (TEM, SEM). We show that the resulting blend morphologies can be identical to those of the unblended SBM at same composition and that, depending on the location in the ternary microphase diagram, one SBM morphology can be converted into multiple different morphologies. Graphical Abstract

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Salts of Organic Acids as Reducing Agents in Atom Transfer Controlled Radical Polymerization

Grishin,

Gulyaeva,

Kuznetsova

et al. 2024

Polym. Sci. Ser. B

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Polyacrylonitrile-containing amphiphilic block copolymers: self-assembly and porous membrane formation

Abstract: Porous nanostructures were derived after self-assembly of amphiphilic poly(acrylonitrile)-containing block copolymers. The introduction of acrylonitrile moieties within the membrane matrix was shown to improve the membranes’ mechanical properties.

Cited by 5 publications

References 89 publications

Isoporous Membranes by the Symmetric Triblock Copolymer: A Strategy to Improve the Mechanical Strength without Sharply Changing the Pore Size and Permselectivity

Isoporous Membranes by the Symmetric Triblock Copolymer: A Strategy to Improve the Mechanical Strength without Sharply Changing the Pore Size and Permselectivity

Multicompartment microparticles of SBM triblock terpolymers: Morphological transitions through homopolymer blending

Salts of Organic Acids as Reducing Agents in Atom Transfer Controlled Radical Polymerization

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