Ethanol‐Responsive Poly(Vinylidene Difluoride) Membranes with Nanogels as Functional Gates

Xie, Rui; Song, Xiaolu; Luo, Feng; Liu, Zhuang; Wang, Wei; Ju, Xiao‐Jie; Chu, Liang‐Yin

doi:10.1002/ceat.201500658

Cited by 8 publications

(4 citation statements)

References 29 publications

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“…Subsequently, the dense layer reduced the exchange rate of water and NMP, causing the development of a finger-like pore structure [ 50 ]. However, the presence of hydrophilic PMO-MGs in the casting solution enhanced the thermodynamic and kinetic instability of casting solution during the NIPS process [ 30 , 51 ]. When microphase separation occurred in the casting solution, the nucleation and growth mechanism state that thermodynamic instability was crucial to the development of microporous structures [ 52 , 53 ].…”

Section: Resultsmentioning

confidence: 99%

“…For example, Wu et al [ 29 ] fabricated thermo-sensitive membranes by grafting poly( N -isopropylacrylamide- co -glycidyl methacrylate) (PNG) thermo-responsive microgels to the aminated poly(ethylene terephthalate) (PET) membranes, and they found that the water flux of the obtained membranes altered abruptly when their temperature reached the volume transition temperature (VTT) of the PNG microgels. Xie et al [ 30 ] used the vapor-induced phase separation (VIPS) method to prepare ethanol-responsive PVDF membranes using poly( N -isopropylacrylamide) (PNIPAM) microgels as intelligent switches, and the obtained membranes showed ethanol- and thermo-responsive characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Thermo-Sensitive Microgel/Poly(ether sulfone) Composited Ultrafiltration Membranes

et al. 2023

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Thermo-sensitive microgels known as PMO-MGs were synthesized via surfactant free emulsion polymerization, with poly(ethylene glycol) methacrylate (OEGMA475) and 2-(2-methoxyethoxy) ethyl methacrylate (MEO2MA) used as the monomers and N, N-methylene-bis-acrylamide used as the crosslinker. PMO-MGs are spherical in shape and have an average diameter of 323 ± 12 nm, as determined via transmission electron microscopy. PMO-MGs/poly (ether sulfone) (PES) composited ultrafiltration membranes were then successfully prepared via the non-solvent-induced phase separation (NIPS) method using a PMO-MG and PES mixed solution as the casting solution. The obtained membranes were systematically characterized via combined X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, Fourier transform infrared spectroscopy and contact angle goniometer techniques. It was found that the presence of PMO-MGs significantly improved the surface hydrophilicity and antifouling performance of the obtained membranes and the PMO-MGs mainly located on the channel surface of the membranes. At 20 °C, the pure water flux increased from 217.6 L·m−2·h−1 for pure PES membrane (M00) to 369.7 L·m−2·h−1 for PMO-MGs/PES composited membrane (M20) fabricated using the casting solution with 20-weight by percentage microgels. The incorporation of PMO-MGs also gave the composited membranes a thermo-sensitive character. When the temperature increased from 20 to 45 °C, the pure water flux of M20 membrane was enhanced from 369.7 to 618.7 L·m−2·h−1.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermo-Sensitive Microgel/Poly(ether sulfone) Composited Ultrafiltration Membranes

et al. 2023

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“…When PNIPAM loading reached a certain value, the alcohol in the aqueous solution could be completely removed by TPU-PNIPAM. When mixing alco- Most previously used PNIPAM copolymers for the selective separation of ethanol from aqueous solutions were prepared in the form of pervaporative membranes, demonstrating excellent ethanol and water separation [40,41]. By contrast, TPU-PNIPAM had a relatively weak ability to selectively absorb ethanol from aqueous solution.…”

Section: Discussionmentioning

confidence: 99%

Thermoplastic Polyurethane-poly(N-isopropylacrylamide) Copolymer for Selective Uptake of Alcohol from Aqueous Solution

Wang,

Cheng,

Zhou

2024

Materials

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Ethanol possesses high economic value, but as an industrial waste, it poses harm to human health and the environment. The paper describes the preparation of a thermoplastic polyurethane-poly (n-isopropylacrylamide) (TPU-PNIPAM) copolymer designed to selectively uptake alcohol in aqueous solution. The material was created by bonding TPU and PNIPAM together through intermolecular hydrogen bonds, enhancing its hydrophobic properties and making it easier to interact with alcohol molecules. As the amount of PNIPAM in TPU increases, the number of hydrophobic isopropyl groups in TPU-PNIPAM also increases, leading to an enhanced selective uptake ability of TPU-PNIPAM for alcohols in aqueous solution. When the temperature reaches 55 °C, the hydrophobic groups in TPU-PNIPAM are more exposed, further enhancing the selective uptake ability of TPU-PNIPAM for alcohols in aqueous solution. TPU-PNIPAM demonstrates selective preferential uptake for various concentrations and types of alcohol in aqueous solutions. The material’s selective uptake performance for alcohols increases with their hydrophobicity, so TPU-PNIPAM exhibited the best adsorption performance for a 10 wt% n-propanol solution under the combined effect of steric hindrance. In addition, TPU-PNIPAM exhibited selective adsorption for other organic solvents, which demonstrated the universality of TPU-PNIPAM in removing contaminants from aqueous solutions.

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“…Various films composed of PNIPAM brush-grafted silica nanoparticles (PNIPAM- g -SiNPs) were exposed to near-saturated ethanol vapor to study their stimuli-responsive behavior. PNIPAM is a polymer that has a satisfactory affinity to ethanol vapor 42 and opens the possibility for future studies on multiresponsive materials due to its thermosensitivity. The novelty of our work is related to the long color recovery times found in such materials, which makes it possible for them to be used for different applications.…”

Section: Introductionmentioning

confidence: 99%

PNIPAM Brushes in Colloidal Photonic Crystals Enable Ex Situ Ethanol Vapor Sensing

Diepenbroek,

Pérez,

de Beer

2023

ACS Appl. Polym. Mater.

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Structural colors are formed by the periodic repetition of nanostructures in a material. Upon reversibly tuning the size or optical properties of the repetitive unit inside a nanostructured material, responsive materials can be made that change color due to external stimuli. This paper presents a simple method to obtain films of ethanol vapor-responsive structural colors based on stacked poly(N-isopropylacrylamide) (PNIPAM)grafted silica nanoparticles. Our materials show clear, reversible color transitions in the presence of near-saturated ethanol vapor. Moreover, due to the absorption of ethanol in the PNIPAM brushes, relatively long recovery times are observed (∼30 s). Materials based on bare or poly(methyl methacrylate) (PMMA) brush-grafted silica nanoparticles also change color in the presence of ethanol vapor but possess significantly shorter recovery times (∼1 s). Atomic force microscopy reveals that the delayed recovery originates from the ability of PNIPAM brushes to swell in ethanol vapor. This renders the films highly suitable for ex situ ethanol vapor sensing.

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Ethanol‐Responsive Poly(Vinylidene Difluoride) Membranes with Nanogels as Functional Gates

Cited by 8 publications

References 29 publications

Thermo-Sensitive Microgel/Poly(ether sulfone) Composited Ultrafiltration Membranes

Thermo-Sensitive Microgel/Poly(ether sulfone) Composited Ultrafiltration Membranes

Thermoplastic Polyurethane-poly(N-isopropylacrylamide) Copolymer for Selective Uptake of Alcohol from Aqueous Solution

PNIPAM Brushes in Colloidal Photonic Crystals Enable Ex Situ Ethanol Vapor Sensing

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