High Flux and Hydrophilic Fibrous Ultrafiltration Membranes Based on Electrospun Titanium Dioxide Nanoparticles/Polyethylene Oxide/Poly(vinylidene fluoride) Composite Scaffolds

A UV photo-grafting method was utilised to enhance the hydrophilicity and anti-fouling property of self-made poly(vinylidene fluoride) (PVDF) ultrafiltration membranes. N,N′-methylene-bisacrylamide (MBAA) was used as monomer and Ce(IV) was used as initiator to obtain balance between grafting treatment consumption and enhanced performance. MBAA could be grafted onto the surface of pure PVDF membranes through a water-phase grafting method under UV photoradiation. When the MBAA concentration was 0.07 mol/L, the Ce(IV) concentration was 0.04 mol/L, and the irradiation duration was 3 min, the membrane surface was grafted with a sufficient amount of monomer under a UV photoradiation intensity of 5.0 mW/cm2. The water contact angle on the surface of the modified membrane decreased by approximately 16°, and flux recovery increased by approximately 40% compared with the pure PVDF membrane when treating river water. For bovine serum albumin rejection and porosity measurements no significant changes were observed between pure PVDF and graft-treated membranes. The enhanced performance of the modified membrane in this work was moderate, but the UV irradiation duration (3 min) was short. The integrative effects of UV modification in this work were satisfactory when both irradiation duration and enhanced performance were considered.

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Reactive Amphiphilic Graft Copolymer Coatings Applied to Poly(vinylidene fluoride) Ultrafiltration Membranes

Macromolecules ◽

10.1021/ma0701033 ◽

2007 ◽

Vol 40 (10) ◽

pp. 3624-3630 ◽

Cited By ~ 65

Author(s):

Ravindra Revanur ◽

Bryan McCloskey ◽

Kurt Breitenkamp ◽

Benny D. Freeman ◽

Todd Emrick

Keyword(s):

Graft Copolymer ◽

Vinylidene Fluoride ◽

Ultrafiltration Membranes ◽

Amphiphilic Graft Copolymer ◽

Poly Vinylidene Fluoride

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Blend-electrospun graphene oxide/Poly(vinylidene fluoride) nanofibrous membranes with high flux, tetracycline removal and anti-fouling properties

Chemosphere ◽

10.1016/j.chemosphere.2018.05.096 ◽

2018 ◽

Vol 207 ◽

pp. 347-356 ◽

Cited By ~ 13

Author(s):

Jeong-Ann Park ◽

Aram Nam ◽

Jae-Hyun Kim ◽

Seong-Taek Yun ◽

Jae-Woo Choi ◽

...

Keyword(s):

Graphene Oxide ◽

Vinylidene Fluoride ◽

High Flux ◽

Poly Vinylidene Fluoride ◽

Nanofibrous Membranes

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Microcellular structure assisted phase transformation of polyvinylidene fluoride/titanium dioxide nanocomposites

Journal of Cellular Plastics ◽

10.1177/0021955x20945666 ◽

2020 ◽

pp. 0021955X2094566

Author(s):

Yu-Chen Sun ◽

Jennifer D’Cunha ◽

Hani E Naguib

Keyword(s):

Phase Transformation ◽

Titanium Dioxide ◽

Polyvinylidene Fluoride ◽

Vinylidene Fluoride ◽

Titanium Dioxide Nanoparticles ◽

Dielectric Constants ◽

Melt Compounding ◽

Β Phase ◽

Composite Foams ◽

Dielectric Performance

A novel nanocomposite foam with microcellular structures based on poly(vinylidene fluoride) (PVDF) and titanium dioxide (TiO2) was fabricated by the combination of melt compounding and supercritical carbon dioxide (scCO2) foaming. To improve its dielectric performance, silane modified and unmodified titanium dioxide nanoparticles were added as reinforcing fillers at low weight percentages (0.5, 1, and 5 wt%) during the melt blending process. It was found that the incorporation of nanoparticles had a strong influence on cell morphology. As a result, the foaming process significantly altered the dielectric, and mechanical properties of the composite foams. The dielectric constants of the composite foams were no longer frequency dependent while tan delta was lowered at least by a factor of 10. Furthermore, the porous structure generated by foaming also assisted the α-to-β phase transformation of the PVDF matrix in a way similar to mechanical stretching. Such method is superior to other phase transformation techniques since β-phase PVDF can be produced in bulk geometries instead of a thin film configuration.

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