Fabrication of PVDF/EVOH blend hollow fiber membranes with hydrophilic property via thermally induced phase process

Xiang, Shang; Tang, Xiuxiu; Rajabzadeh, Saeid; Zhang, Pengfei; Cui, Zhenyu; Matsuyama, Hideto

doi:10.1016/j.seppur.2022.122031

Cited by 13 publications

(2 citation statements)

References 52 publications

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“…As can be seen in Table 2 , the polymer ratio (PVDF/PES) significantly affected the mechanical properties of the synthesized membranes. Tensile strength at break tended to decrease with the presence of PVDF; however, there was an increase in plasticity of the material, which is indicated by the high elongation at break, a characteristic caused by the presence of PVDF [ 20 ]. Another important mechanical property is the Young’s modulus (elasticity of the material), which indicates the maximum force applied to the material without irreversibly deforming it, altering the porous microstructure of the material.…”

Section: Resultsmentioning

confidence: 99%

A New Approach to the Development of Hollow Fiber Membrane Modules for Water Treatment: Mixed Polymer Matrices

et al. 2023

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In this study, mixed matrix hollow fiber polymeric membranes were prepared using polyethersulfone (PES) and polyvinylidene fluoride (PVDF) as polymers in their composition. N-methyl-2-pyrrolidone (NMP) was used as a solvent and demineralized water with an electrical conductivity below 3 μS·cm−1 was used as a non-solvent. A new approach to producing enhanced polymeric hollow fiber membranes based on the preparation of a simple blend PVDF/PES solution, and on the conformation of the composite membranes through the extrusion technique followed by the phase inversion process in a non-solvent bath, was applied. The investigation focused on the preparation of polymeric membranes with different polymer ratios and further assessment of the effects of these proportions on the membrane performance and in specific physical properties. The amount of PVDF ranged from 10 to 90% with 10% steps. The presence of PVDF, although it increased the membranes’ plasticity, had a negative effect on the overall mechanical properties of the composite membranes. Scanning electron microscopy (SEM) results showed good dispersion of both polymers in the polymeric matrix. Furthermore, the membrane permeability showed a slight negative correlation with contact angle, suggesting that membrane hydrophilicity played an important role in membrane permeability. Finally, it was found that membranes with low ratios of PVDF/PES may have potential for water treatment applications, due to the combined advantageous properties of PES and PVDF.

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Section: Resultsmentioning

confidence: 99%

A New Approach to the Development of Hollow Fiber Membrane Modules for Water Treatment: Mixed Polymer Matrices

et al. 2023

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“…According to Wenzel’s model, the properties of hydrophilic/oleophobic are associated with the chemical composition as well as the surface microstructure [ 26 , 27 ]. In the last decade, blending, graft polymerization, and surface coating methods have been widely used to design superwetting membranes [ 28 , 29 , 30 ]. Teng et al [ 31 ] embedded epoxied SiO 2 nanoparticles and polyethyleneimine on the poly (vinylidene fluoride) (PVDF) membranes via a dip-coating process to form a hydrophilic layer, and the modified membranes retained over 98% of the oil during oil/water separation.…”

Section: Introductionmentioning

confidence: 99%

Demulsifier-Inspired Superhydrophilic/Underwater Superoleophobic Membrane Modified with Polyoxypropylene Polyoxyethylene Block Polymer for Enhanced Oil/Water Separation Properties

et al. 2023

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Demulsifiers are considered the key materials for oil/water separation. Various works in recent years have shown that demulsifiers with polyoxypropylen epolyoxyethylene branched structures possess better demulsification effects. In this work, inspired by the chemical structure of demulsifiers, a novel superhydrophilic/underwater superoleophobic membrane modified with a polyoxypropylene polyoxyethylene block polymer was fabricated for enhanced separation of O/W emulsion. First, a typical polyoxypropylene polyoxyethylene triblock polymer (Pluronic F127) was grafted onto the poly styrene-maleic anhydride (SMA). Then, the Pluronic F127-grafted SMA (abbreviated as F127@SMA) was blended with polyvinylidene fluoride (PVDF) for the preparation of the F127@SMA/PVDF ultrafiltration membrane. The obtained F127@SMA/PVDF ultrafiltration membrane displayed superhydrophilic/underwater superoleophobic properties, with a water contact angle of 0° and an underwater oil contact angle (UOCA) higher than 150° for various oils. Moreover, it had excellent separation efficiency for SDS-stabilized emulsions, even when the oil being emulsified was crude oil. The oil removal efficiency was greater than 99.1%, and the flux was up to 272.4 L·m−2·h−1. Most importantly, the proposed F127@SMA/PVDF membrane also exhibited outstanding reusability and long-term stability. Its UOCA remained higher than 150° in harsh acidic, alkaline, and high-salt circumstances. Overall, the present work proposed an environmentally friendly and convenient approach for the development of practical oil/water separation membranes.

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Hollow fiber membranes

García-Fernández,

Ferreiro,

García-Payo

et al. 2024

Polymeric Membrane Formation by Phase Inversion

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Fabrication of PVDF/EVOH blend hollow fiber membranes with hydrophilic property via thermally induced phase process

Cited by 13 publications

References 52 publications

A New Approach to the Development of Hollow Fiber Membrane Modules for Water Treatment: Mixed Polymer Matrices

A New Approach to the Development of Hollow Fiber Membrane Modules for Water Treatment: Mixed Polymer Matrices

Demulsifier-Inspired Superhydrophilic/Underwater Superoleophobic Membrane Modified with Polyoxypropylene Polyoxyethylene Block Polymer for Enhanced Oil/Water Separation Properties

Hollow fiber membranes

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