Amphiphilic gradient copolymers: Synthesis, self-assembly, and applications

Chen, Yanjun; Chen, Hao; Feng, Mengran; Dong, Yixiao

doi:10.1016/j.eurpolymj.2016.11.009

Cited by 31 publications

(26 citation statements)

References 49 publications

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“…That ends up in more intense hydrophobic interactions and clustering because a certain amount of the more hydrophobic APi units is still present in the entangling coronas . To some extent, the transition hence resembles the one of gradient copolymers, and our block–random copolymer can indeed be seen as a gradient copolymer with an extremely curved hyperbolic composition profile …”

Section: Resultsmentioning

confidence: 81%

“…Block–random copolymer micelles can furthermore benefit from a weak association, thus generating more dynamic reversible structures as opposed to the often glassy kinetically‐frozen micelles of conventional block copolymers . In a sense, they therefore combine the properties of block copolymers with the dynamic self‐assembly of gradient copolymers …”

Section: Introductionmentioning

confidence: 99%

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Double thermoresponsive block–random copolymers with adjustable phase transition temperatures: From block‐like to gradient‐like behavior

Eggers

Eckert

Abetz

2017

J. Polym. Sci. Part A: Polym. Chem.

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Stimuli‐responsive block–random copolymers are very useful “smart” materials as their switching behavior can be tuned by simply adjusting the composition of the random copolymer block. Because of that, we synthesized double thermoresponsive poly(N‐acryloylpyrrolidine)‐block‐poly(N‐acryloylpiperidine‐co‐N‐acryloylpyrrolidine) (PAPy‐b‐P(APi‐co‐APy)) copolymers via reversible addition fragmentation chain transfer (RAFT) polymerization and investigated their temperature‐induced self‐assembly in aqueous solution. By varying the APi/APy ratio in the random copolymer block, its phase transition temperature (PTT1) can indeed be precisely adjusted while the temperature‐induced collapse upon heating leads to a fully reversible well‐defined micellization. By making the two blocks compositionally similar to more than 60%, the polymers' mechanistic thermoresponsiveness can furthermore be changed from block‐like to rather gradient‐like behavior. This means the micellization onset at PTT1 and the corona collapse at the PTT of the more hydrophilic pure PAPy block (PTT2) overlap resulting in one single broad transition. This work thus contributes to the detailed understanding of design, synthesis and mechanistic behavior of tailored “on‐demand” switchable materials. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 399–411

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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Double thermoresponsive block–random copolymers with adjustable phase transition temperatures: From block‐like to gradient‐like behavior

Eggers

Eckert

Abetz

2017

J. Polym. Sci. Part A: Polym. Chem.

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“…Compared with other methods, blend modification has more practical significance . In recent years, amphiphilic copolymers used as additives to prepare blend‐modified membranes have received extensive attention . When the amphiphilic polymer is mixed into the casting solution as an additive, the main hydrophobic backbone gains compatibility with the membrane material during phase inversion.…”

Section: Introductionmentioning

confidence: 99%

Effect of ethanol in the coagulation bath on the structure and performance of PVDF‐g‐PEGMA/PVDF membrane

Tang

Sun

et al. 2018

J of Applied Polymer Sci

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This report investigated the effect of ethanol content in the coagulation bath on the surface composition, membrane pore size structure, pure water flux, and permeability of the amphiphilic polymer polyvinylidene fluoride (PVDF)-g-poly (ethylene glycol) methyl ether methacrylate (PEGMA)-modified PVDF membrane. The study found that pore size and their distribution and, as a result, membrane permeability, can also be easily controlled by adjusting ethanol content in the coagulation bath. Membrane water fluxes formed by the coagulation baths with 0, 10, 20, and 30% of ethanol were 1843. 65, 2774.61, 4391.88, and 5142.35 L (m −2 Áh −1 ). When the content of ethanol in the coagulation bath is high, the surface enrichment of PEGMA slightly decreases, and the surface becomes rougher. Thus, the decrease of the hydrophilic functional groups on the surface of the membrane and the increase of the roughness leads to the deterioration of the hydrophilicity of the membranes surface.

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“…Gradient copolymers are predicted to have improved physical characteristics, especially those related to surfactants and dispersants, but also for use in more diverse applications such as fiber optics, battery electrolytes, and lenses …”

Section: Introductionmentioning

confidence: 99%

Preparation of Forced Gradient Copolymers Using Tube‐in‐Tube Continuous Flow Reactors

Saubern

Nguyen

et al. 2017

Macro Reaction Engineering

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The preparation of forced gradient polymers has received considerable attention using batch reactors, while the preparation of usable quantities of forced gradient copolymers using continuous flow reactors has been hampered by the need to vary the composition of the monomer feedstock continuously during the reaction. A reactor that allows for addition of a monomer feedstock continuously at all points along the length of the reactor tubing allows for the preparation of forced gradient copolymers in continuous flow reactors, allowing for the scale‐up and bulk preparation of these polymers. This study reports here the initial investigation of preparing forced gradient copolymers using the reversible addition–fragmentation chain transfer methodology in tube‐in‐tube continuous flow reactors.

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Amphiphilic gradient copolymers: Synthesis, self-assembly, and applications

Cited by 31 publications

References 49 publications

Double thermoresponsive block–random copolymers with adjustable phase transition temperatures: From block‐like to gradient‐like behavior

Double thermoresponsive block–random copolymers with adjustable phase transition temperatures: From block‐like to gradient‐like behavior

Effect of ethanol in the coagulation bath on the structure and performance of PVDF‐g‐PEGMA/PVDF membrane

Preparation of Forced Gradient Copolymers Using Tube‐in‐Tube Continuous Flow Reactors

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