Block copolymer micelle formation in a solvent good for all the blocks

Ye, Xianggui; Niroomand, Hanieh; Hu, Sheng; Khomami, Bamin

doi:10.1007/s00396-015-3658-9

Cited by 15 publications

(16 citation statements)

References 32 publications

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“…A common approach to produce desired aggregate structures from copolymers is to first dissolve the copolymer in a common solvent that dissolves all the blocks, then gradually add a selective precipitant of one of the blocks, and finally remove the common solvent. − We recently demonstrated that polystyrene- block -poly(4-vinylpyridine) (PS- b -P4VP) with a wide range of molecular weights and P4VP composition in dimethylformamide (DMF) forms soft-core spherical micelles, where the micelle core is a PS block and the micelle corona is a P4VP block . Specifically, when the PS block is the majority component, the soft-core micelles in solution are crew-cut.…”

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“…23−30 We recently demonstrated that polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) with a wide range of molecular weights and P4VP composition in dimethylformamide (DMF) forms soft-core spherical micelles, where the micelle core is a PS block and the micelle corona is a P4VP block. 31 Specifically, when the PS block is the majority component, the soft-core micelles in solution are crew-cut. In this context, with a crew-cut soft-core micelle in DMF, it is possible to fabricate patchy particles by adding a liquid that is a nonsolvent for the PS-forming core and a slightly inferior solvent for the corona-forming P4VP block.…”

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confidence: 99%

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Template-Free Bottom-Up Method for Fabricating Diblock Copolymer Patchy Particles

Sun

et al. 2016

ACS Nano

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Patchy particles are one of most important building blocks for hierarchical structures because of the discrete patches on their surface. We have demonstrated a convenient, simple, and scalable bottom-up method for fabricating diblock copolymer patchy particles through both experiments and dissipative particle dynamics (DPD) simulations. The experimental method simply involves reducing the solvent quality of the diblock copolymer solution by the slow addition of a nonsolvent. Specifically, the fabrication of diblock copolymer patchy particles begins with a crew-cut soft-core micelle, where the micelle core is significantly swelled by the solvent. With water addition at an extremely slow rate, the crew-cut soft-core micelles first form a larger crew-cut micelle. With further water addition, the corona-forming blocks of the crew-cut micelles begin to aggregate and eventually form well-defined patches. Both experiments and DPD simulations indicate that the number of patches has a very strong dependence on the diblock copolymer composition-the particle has more patches on the surface with a lower volume fraction of patch-forming blocks. Furthermore, particles with more patches have a greater ability to assemble, and particles with fewer patches have a greater ability to merge once assembled.

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Template-Free Bottom-Up Method for Fabricating Diblock Copolymer Patchy Particles

Sun

et al. 2016

ACS Nano

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“…The selection of monomers depends on their intended applications. Amphiphilic block copolymers have attracted significant attraction due to their self-assembly in selective solvents to form vesicles or micelles based on the solubility of their hydrophilic and hydrophobic segments [4,5]. Among them, stimuliresponsive polymers have been in the focus of intensive research in the last decade.…”

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confidence: 99%

Synthesis of amphiphilic block copolymers containing ferrocene–boronic acid and their micellization, redox-responsive properties and glucose sensing

Saleem

Wang

et al. 2017

Colloid Polym Sci

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Amphiphilic block copolymer PMAEFc-b-PMVAPBA was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. The hydrophobic and hydrophilic blocks of copolymers self-assembled into spherical micelles in aqueous solution. The redox behaviour of ferrocene was studied by using water-soluble (NH 4 ) 2 Ce(NO 3 ) 6 and NaHSO 3 as the oxidizing agent and reducing agent, respectively. The change in polarity and swelling of micelles increased the hydrodynamic diameter due to the oxidation of ferrocene, while glucose binding with boronic acid hydroxyls leads to unimers or smaller aggregates. TEM and DLS were used to investigate the redox-controlled behaviour of micelles. This redox-responsive behaviour would provide a prerequisite for detection/binding of biological analytes study and redox-controlled release of drug.

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“…We selected 1,4‐dioxane: N ‐methyl‐2‐pyrrolidone (DOX:NMP) at a 9:1 weight ratio and pure NMP as solvent systems for SV and PSf, respectively (Figure 1a,c). Although the SV micellar structure in such an amphiphilic solvent system is not trivial and still remains controversial, [ 37–39 ] our recent 1 H nuclear magnetic resonance (NMR) study of SV in tetrahydrofuran: N , N ‐dimethylformamide (THF:DMF) of 9:1 weight ratio based on spin–spin relaxation analysis supported that V is in the core and S is in the corona with a critical micelle concentration (CMC) somewhere between 0.1 and 0.5 wt%. [ 27 ] For the SV/DOX/NMP system investigated here we will assume V‐core S‐corona micelles in analogy to the SV/THF/DMF system.…”

Section: Resultsmentioning

confidence: 99%

Surface Segregation and Self‐Assembly of Block‐Copolymer Separation Layers on Top of Homopolymer Substructures in Asymmetric Ultrafiltration Membranes from a Single Casting Step

Hibi

Wiesner

2021

Adv Funct Materials

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Surface segregation in blended polymer films has attracted much interest in fundamental research as well as for practical applications. A variety of methodologies have been proposed for controlling surface segregation. They often require long annealing times, however, to achieve thermodynamic equilibrium. Here, a strategy and proof-of-principle experiments are described to control surface segregation of thin block-copolymer (BCP) layers on top of a homopolymer in a single casting step from blended BCP/homopolymer solutions. The surface coverage by the minor constituent BCP (2-10 wt%) is accomplished despite almost identical surface energies of BCP and homopolymer constituents. Immersing this casted solution into water for nonsolvent induced phase separation (NIPS), a nonequilibrium process, affords solidified bilayer ultrafiltration membranes composed of a thin porous surface layer of self-assembled BCP atop an asymmetric porous homopolymer substructure. Key to successful BCP surface segregation is the choice of a binary solvent system based on careful considerations of solvent surface energies and polymer-solvent interaction parameters. Furthermore, stabilizing the BCP micellar structure by a divalent metal additive is also essential. The approach provides a cost-effective method for fabricating bilayer-type asymmetric ultrafiltration membranes with uniform BCP self-assembly based selective top surface pore layers in a single casting step.

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Block copolymer micelle formation in a solvent good for all the blocks

Cited by 15 publications

References 32 publications

Template-Free Bottom-Up Method for Fabricating Diblock Copolymer Patchy Particles

Template-Free Bottom-Up Method for Fabricating Diblock Copolymer Patchy Particles

Synthesis of amphiphilic block copolymers containing ferrocene–boronic acid and their micellization, redox-responsive properties and glucose sensing

Surface Segregation and Self‐Assembly of Block‐Copolymer Separation Layers on Top of Homopolymer Substructures in Asymmetric Ultrafiltration Membranes from a Single Casting Step

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