Poly(vinylidene fluoride)/molybdenum disulfide nanocomposite coatings: Studying the surface properties and corrosion protection

Abstract

Robust nanocomposite coatings based on polyvinylidene fluoride (PVDF) and molybdenum disulfide (MoS 2 ) nanoplatelets were prepared by a spray coating method. To achieve various surface structures, the coatings were dried at room and oven temperatures (20 and 200 C). All the samples dried at room temperature exhibited a highly porous surface structure, attributed to the strong nonsolvent role of water vapor, which triggered the nonsolvent-induced phase separation (VIPS). On the other hand, the oven-dried coatings showed a dense structure with no pores, resulting from eliminating the VIPS process by enhancing the drying temperature. MoS 2 nanoplatelets were localized at the surface layer and the adjacent beneath layers. The formation of α-type PVDF crystals was intensified for the oven-dried samples based on the surface morphology and X-ray diffraction patterns. Roughness analysis demonstrated that MoS 2 nanoplatelets interfere with the phase separation process leading to a lower porosity for the room-dried coatings. The elimination of porosity by increasing the drying temperature caused the hydrophobicity of the coatings to be notably decreased. Polarization and electrochemical impedance spectroscopy results revealed that both polymeric and nanocomposite coatings improved the corrosion resistance of the aluminum substrates, and the ovendried pure PVDF coating exhibited the highest level of corrosion protection.

From two‐dimensional materials to polymer nanocomposites with emerging multifunctional applications: A critical review

“…[ 91,92 ] However, although the exfoliation of MoS 2 to monolayer was performed for the first time in 1986, [ 93 ] major attention to the material was drawn only after the emergence of graphene. [ 94–99 ] As soon as Geim and Novoselov's [ 100 ] discussion on the “electric field effect in atomically thin carbon films” gained momentum, several researchers devoted their attention to MoS 2 and other TMDs.…”

“…[91,92] However, although the exfoliation of MoS 2 to monolayer was performed for the first time in 1986, [93] major attention to the material was drawn only after the emergence of graphene. [94][95][96][97][98][99] As soon as Geim and Novoselov's [100] discussion on the T A B L E 3 Thermal conductivity of the addressed 2DM and some derivatives…”

Flexible electrospun PVDF/WO3 nanocomposite fibers for piezoelectric energy harvesting applications

“…Alternatively, piezoelectric polymers have shown a significant role in energy harvesting for similar applications accounting for the benefits of inexpensive, high flexibility, low weight, and ability to form complicate contours 11 . The different piezoelectric polymers like poly‐L‐lactic acid, polyvinylidene fluoride (PVDF) and their co‐polymers are widely known for their piezoelectric behavior used in different applications such as electromagnetic interference shielding, corrosion, additive manufacturing and structural health monitoring 12–16 . In comparison with all these piezoelectric materials, PVDF has better formability and good piezoelectric responses 17–19 …”

A simple and effective method to adjust the size of micropores on the inner surface of Polyvinylidene fluoride hollow fiber membranes

“…Polyvinylidene fluoride (PVDF) is often employed as a matrix material in the preparation of separation membranes due to its superior physical and chemical stability. [1][2][3][4][5] It is used extensively in membrane distillation, permeation gasification, microfiltration, ultrafiltration, and other membrane species. Currently, non-solvent induced phase transition (NIPS) is one of the most used techniques for preparing PVDF membranes.…”