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In this paper, the superhydrophobic poly­(phenylene sulfide) (PPS)/polytetrafluoroethylene (PTFE) composite coating was fabricated and applied to evaluate the antiscaling performance. Compared with the commercial hydrophobic epoxy–silicone resin coating, the superhydrophobic PPS/PTFE composite coating exhibited unique antiscaling performance. The deposition rate of CaCO3 scaling on the superhydrophobic PPS/PTFE coating was only 38.6% of that on the epoxy–silicone resin coating. The surface morphology, size, and crystal type of the scaling were analyzed. The results indicated that the formation and growth of CaCO3 scaling were significantly influenced by the cooperative effect of topography and low surface energy of the superhydrophobic PPS/PTFE composite coating. There were few nucleation sites at the surface of superhydrophobic coating owing to the relatively low surface energy and absorbed bubbles. Together with the space constraint of the topography, the nucleation and growth of CaCO3 scaling were inhibited on the surface of superhydrophobic PPS/PTFE coating.

Foam-based material with unique wettability is one of the promising materials for developing oil-spill cleanup, benefiting from its intrinsic interconnected three-dimensional skeleton, oil permeation and water repellency. However, obtaining a foam-based material capable of in situ separating oil spills, especially with superhydrophobic durability and simple recycling mode, remains challenging. Herein, we reported a one-step spraying approach to fabricate fluorinated ethylene propylene (FEP)/ polyvinylidene fluoride (PVDF)/ ultrafine polyurethane (UPU)/ hydrophobic nanosilica (HSiO 2)-decorated nickel foam coating with a static water contact angle (WCA) of 157±1.5˚ and a static oil contact angle (OCA) of 0˚. Owing to the foldability of the coated nickel foam, we established a continuous in-situ collection apparatus by external pumping on 3D nickel foam box. UPU addition endowed the resultant 3D nickel foam with excellent interfacial adhesion. After 7 days of continuous oil-water experiment that simulated cleanup oil-spill, the static WCA of the 3D nickel foam with 10 wt% UPU was still above 130˚. Notablely, after heat treatment at 240 ℃, the fabricated 3D nickel foam coating could be refreshed from the damaged surface to superhydrophobic.

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Please cite this article in press as: X. Zhang, et al., Fabrication of durable fluorine-free superhydrophobic polyethersulfone (PES) composite coating enhanced by assembled MMT-SiO 2 nanoparticles, Appl. Surf. Sci. (2016), http://dx. a b s t r a c tA durable fluorine-free polyethersulfone (PES) superhydrophobic composite coating with excellent wearresistant and anti-corrosion properties has been successfully fabricated by combining sol-gel and spray technology. The robust micro/nano-structures of the prepared surface were established by introducing binary montmorillonite-silica (MMT-SiO 2 ) assembled composite particles, which were formed by in-situ growth of SiO 2 on MMT surfaces via sol-gel. Combined with the low surface energy of amino silicon oil (APDMS), the fluorine-free superhydrophoic PES coating was obtained with high water contact angle 156.1 ± 1.1 • and low sliding angle 4.8 ± 0.7 • .The anti-wear of the final PES/APDMS/MMT-SiO 2 superhydrophobic coating can reach up to 60,100 cycles, which is outdistancing the pure PES coating (6800 cycles) and the PES/MMT/SiO 2 coating prepared by simple physical mixture (18,200 cycles). The enhanced wear resistance property can be mainly attributed to the lubrication performance of APDMS and stable interface bonding force between the MMT surface and SiO 2 . Simultaneously, potentiodynamic polarization curves and electrochemical impedance spectroscopy exhibited the outstanding anti-corrosion property of PES/APDMS/MMT-SiO 2 composite coating, with low corrosion current (1.6 × 10 −10 A/cm 2 ) and high protection efficiency (99.999%) even after 30 d immersion process. These test results show that this durable superhydrophobic PES composite coating can be hopefully to provide the possibility of industrial application.

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