Covalent surface entanglement of polyvinylidene fluoride membranes with carbon nanotubes

Al‐Gharabli, Samer; Kujawa, Joanna; Mavukkandy, Musthafa O.; Agbaje, Taofeeqah A.; Hamad, Eyad M.; Arafat, Hassan A.

doi:10.1016/j.eurpolymj.2018.01.027

Cited by 11 publications

(3 citation statements)

References 62 publications

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“…The high hydrophobicity of PVDF has made membranes have a high fouling potential due to organic pollutants deposition in the surface and internal pore, resulting in decreased PWF and specific permeability [10][11][12][13] . A number of attempts to make the whole hydrophobic membrane become hydrophilic, such as surface coating, chemical grafting, and blending or addition of inorganic hydrophilic additives are performed to achieve improved hydrophilic and PWF properties as well as reduction of the membrane fouling potential [14][15][16][17][18][19][20][21][22][23][24][25][26][27] . Among these efforts, blending of polymers with higher hydrophilic properties such as polyetherimide (PEI) into PVDF cast solution to form composite membranes has shown effectiveness in reducing hydrophobicity and fouling potential of membranes also predicted to be able to present increased mechanical strength and PWF at the same time due to the unique morphology possessed by the PEI membrane [28][29] .…”

Section: Introductionmentioning

confidence: 99%

The Development of PVDF/Pei Blended Membrane: Effect of Stirring Time on Membrane Characteristics and Performance

Kusumawati¹,

Setiarso²,

Santoso³

et al. 2019

RJC

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The increased characteristics and performance of polyvinylidene fluoride (PVDF) membrane were investigated using polyetherimide (PEI) as a high-performance co-polymer for increased porosity, mechanical strength, PWF and thermal also chemical stability. The blend solution was prepared using a composition 2%PVDF/12%PEI/84%NMP/2%PEG-6000 (wt.%) with varying stirring time (7h, 12h, 16h, and 20h). The formation of a solid PVDF/PEI membrane was obtained using a non-solvent induced phase inversion (NIPS) method. Analysis of physical (surface and cross-section morphology, porosity, pore size) and mechanical (Young's modulus) characteristics, performance (PWF), thermal and chemical stability of the blended membranes were performed to evaluate the significance of stirring time effect. The resulting infrared spectra have confirmed the formation of PVDF/PEI blended membrane. All PVDF/PEI blended membranes were found to have symmetric structures with porosity 6.17% -30.64% and pore size 0.204 nm -0.366 nm. The increase in mechanical strength can be seen from changes in Young's modulus values as the stirring time increases up to 12 hours. However, the stirring time for 16 and 20 hours resulted in a cast solution with too high viscosity resulting in a defect in the casting film using the automatic-casting knife. Increasing the homogeneity of PVDF/PEI cast solution as increasing stirring time has led to PEI characteristic properties that are capable of producing high PWF. This PVDF/PEI mixing method is a potential solution to obtain higher PVDF thermal stability and PEI chemical resistance.

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Section: Introductionmentioning

confidence: 99%

The Development of PVDF/Pei Blended Membrane: Effect of Stirring Time on Membrane Characteristics and Performance

Kusumawati¹,

Setiarso²,

Santoso³

et al. 2019

RJC

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“…In this case, the hydroxylation changes the membrane morphology, increasing the membrane pore size even by 53.5%, the crystallinity, and the roughness (an increase of 43%). [ 70 ] Combining PR hydroxylation and membrane silanization also increases the membrane pore size and the opening structure while decreasing the membrane surface energy. As a result, higher contact angles than those in single‐step oxidation are obtained.…”

Section: Coatingmentioning

confidence: 99%

Membrane Surface Modification by Electrospinning, Coating, and Plasma for Membrane Distillation Applications: A State‐of‐the‐Art Review

et al. 2021

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Membrane distillation (MD) is a thermally driven separation process where a hydrophobic and microporous membrane separates nonvolatile compounds. Because of its advantages, this process appears as an efficient way to recover water from industrial effluents. However, the commercial membranes used in the MD process still have operational troubles with complex industrial wastewater and against harsh operational conditions. Fouling, wetting, and low time of operation compromise the membrane function and make the total consolidation of MD technology difficult beyond the traditional application (desalination). Membrane modification can be key to mitigating these operational problems, allowing MD's expansion to complex separations. In this context, herein the main technologies to modify the membranes for MD applications of the last five years are comprehensively summarized. Three kinds of postfabrication modifications are focused on: electrospinning, coating, and plasma, including polymeric and ceramic membranes. A critical analysis of each technique is developed, discussing their potentialities and the properties achieved through them. This review enables the understanding of the operational problems of MD technology and leads to finding feasible alternatives to their mitigation. It also clarifies the evolution in membrane modification, discusses the development directions, and points out the future challenges of modifications.

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“…In addition, the composition of CNTs/PVDF composite and pure PVDF membranes are also characterized by Raman spectra (Figure 2d). The characteristic D, G, and D bands of CNTs are marked at about 1351, 1585, and 2699 cm −1 , respectively, [ 34,35 ] which suggests that the CNTs are attached to PVDF in the CNTs/PVDF composite.…”

Section: Figurementioning

confidence: 99%

Interfacial Fabrication of CNTs/PVDF Bilayer Actuator with Fast Responses to the Light and Organic Solvent Vapor Stimuli

Gui

Yan

et al. 2020

Macro Materials & Eng

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A multiple stimuli‐responsive actuator with an ability of rapid and sensitive responding is highly desirable for the development of biomimetic actuation applications. Herein, a bilayer actuator with fast and sensitive responses to acetone vapor and light stimuli is reported based on polyvinylidene fluoride (PVDF) membrane with a hierarchical porosity and macroscopic carbon nanotubes (CNTs) assembled film. The CNTs film with uniform and tunable thickness is prepared by a macroscopic interfacial assembly strategy and transferred integrally onto the PVDF membrane. Under the infrared light, this CNTs/PVDF bilayer actuator can bend rapidly within 1 s and generate large stress. Moreover, for the acetone vapor stimuli, the actuator bends within 0.19 s and also reverses in 1.24 s to the initial state, showing sensitive and fast responses to acetone stimuli, as well as outstanding stability and repeatability.

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Covalent surface entanglement of polyvinylidene fluoride membranes with carbon nanotubes

Cited by 11 publications

References 62 publications

The Development of PVDF/Pei Blended Membrane: Effect of Stirring Time on Membrane Characteristics and Performance

The Development of PVDF/Pei Blended Membrane: Effect of Stirring Time on Membrane Characteristics and Performance

Membrane Surface Modification by Electrospinning, Coating, and Plasma for Membrane Distillation Applications: A State‐of‐the‐Art Review

Interfacial Fabrication of CNTs/PVDF Bilayer Actuator with Fast Responses to the Light and Organic Solvent Vapor Stimuli

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