Synthesis of durable hydrophobic fluorinated polyurethanes with exceptional cavitation erosion resistance

Li, Ning; Yang, Rui; Tian, Ye; Lu, Pengfei; Huang, Nengliang; Li, Hua; Chen, Xiuyong

doi:10.1016/j.triboint.2022.107973

Cited by 12 publications

(5 citation statements)

References 53 publications

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“…The low-surface-energy groups in the side chains of FPU improve the hydrophobicity of the nanofiber surface. 44 The infiltration property characterization results for the nanofiber membranes reveal that when the FPU content is 18%, the WCA and oil contact angle of the PAN-FPU nanofiber membranes are 153 and 130°, respectively, showing hydrophobic and oleophobic properties (Figure 6b). This finding indicates that the surface energy of the nanofiber membrane is lower than that of the oil body.…”

Section: Wettability Of the Membranementioning

confidence: 99%

Electrospun Polyacrylonitrile-Fluorinated Polyurethane/Polysulfone Nanofiber Membranes for Oil–Water Separation

Han,

Yu,

Chen

et al. 2024

ACS Appl. Nano Mater.

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Electrospun nanofiber membranes exhibit efficient oil−water separation performance, owing to their fine and controllable fiber diameters. However, the three-dimensional dense stacking of nanofibers leads to low porosity, decreasing the oil flux in oil−water separation. Here, a composite nanofiber membrane with a dual-scale structure was designed to achieve a high oil−water separation efficiency and high oil flux simultaneously. In detail, a dense polyurethane/fluorinated polyurethanes (PAN-FPU) nanofiber layer with a fine fiber diameter (150 nm) and a small pore size (3−4 μm) was combined with a fluffy polysulfone (PSF) nanofiber layer with a coarse diameter (1200 nm) and a large pore size (8−9 μm). Using the PAN-FPU nanofiber layer as the inlet layer, modular electrospinning equipment was used to prepare dual-scale nanofiber membranes with a high oil−water separation efficiency and high flux in one step. When the fiber ratio of PAN-FPU/PSF was 1:2, the resulting composite nanofiber film could achieve a separation efficiency of 99.58% and an oil flux of 4630 L m −2 h −1 for an oil−water mixture. For a water-in-oil emulsion, the separation efficiency and oil flux reached 99.37% and 1124 L m −2 h −1 , respectively. In addition, the separation efficiency and flux of the biscale nanofiber membrane were simulated by establishing a fluid model, and the simulation results confirmed that the fiber membrane had excellent separation performance. Dual-scale composite nanofiber membranes have potential applications in the field of oily wastewater treatment and locomotive filters compared with monolayer membranes.

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Section: Wettability Of the Membranementioning

confidence: 99%

Electrospun Polyacrylonitrile-Fluorinated Polyurethane/Polysulfone Nanofiber Membranes for Oil–Water Separation

Han,

Yu,

Chen

et al. 2024

ACS Appl. Nano Mater.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Synthesis, Structure, Properties, and Applications of Fluorinated Polyurethane

Li,

Yu,

et al. 2024

Polymers

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Fluorinated polyurethane (FPU) is a new kind of polyurethane (PU) material with great applicational potential, which is attributed to its high bond energy C-F bonds. Its unique low surface energy, excellent thermal stability, and chemical stability have attracted considerable research attention. FPU with targeted performance can be precisely synthesized through designing fluorochemicals as hard segments, soft segments, or additives and changes to the production process to satisfy the needs of coatings, clothing textiles, and the aerospace and biomedical industries for materials that are hydrophobic and that are resistant to weathering, heat, and flames and that have good biocompatibility. Here, the synthesis, structure, properties, and applications of FPU are comprehensively reviewed. The aims of this research are to shed light on the design scheme, synthesis method, structure, and properties of FPU synthesized from different kinds of fluorochemicals and their applications in different fields and the prospects for the future development of FPU.

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“…Among the various techniques, thermal spraying methods have been extensively used to deposit coatings [ 6 ]. Until now, many kinds of coating materials, including engineering alloys [ 7 ], ceramics [ 8 ], and plastics [ 9 ], have been applied on metal alloy components to protect against cavitation erosion. Although many studies have been done on the cavitation erosion resistance of thermal sprayed coatings, the cavitation erosion mechanism of the coatings remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Effect of Initial Surface Scratches on the Cavitation Erosion Behavior of 316L Stainless Steel Substrates and 316L Stainless Steel Coatings

Tian

et al. 2023

Materials

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Rough surfaces have been widely considered as negative factors affecting cavitation erosion resistance. However, this study presented the opposite result. Here, 316L stainless steel substrates and the arc-sprayed 316L stainless steel coatings were subjected to a specific grinding process that introduced scratches on the surfaces. The surface hardness values of these ground specimens were measured to evaluate the influence of the grinding-induced strain hardening. The cavitation erosion performance of the specimens was evaluated. The results showed that rough surfaces with scratches could enhance the cavitation erosion resistance, particularly at the early stage of cavitation erosion. The scratches had a greater effect on the cavitation erosion resistance of the coatings than on the substrates. Moreover, rough surfaces with initial surface scratches could extend the incubation period of the 316L stainless steel substrates due to the inhibition of the plastic deformation. The SEM observation showed that the scratch structure of the coating surface inhibited the growth of cracks and the propagation of cavitation pits. This study could also serve as a reference for investigating the cavitation erosion behaviors of materials with a particular surface feature.

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Synthesis of durable hydrophobic fluorinated polyurethanes with exceptional cavitation erosion resistance

Cited by 12 publications

References 53 publications

Electrospun Polyacrylonitrile-Fluorinated Polyurethane/Polysulfone Nanofiber Membranes for Oil–Water Separation

Electrospun Polyacrylonitrile-Fluorinated Polyurethane/Polysulfone Nanofiber Membranes for Oil–Water Separation

Synthesis, Structure, Properties, and Applications of Fluorinated Polyurethane

Effect of Initial Surface Scratches on the Cavitation Erosion Behavior of 316L Stainless Steel Substrates and 316L Stainless Steel Coatings

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