Fluorinated Copolymer-Oxide Hybrids

Bescher, Eric P.; Noori, A.; Mackenzie, John D.

doi:10.1007/s10971-004-5767-7

Cited by 6 publications

(7 citation statements)

References 4 publications

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“…This behavior allows to enhance the corrosion protection of the substrates by indirectly avoiding the contact between the metallic surface and the aggressive species [292][293][294][295]. In the last few years, the literature reported on this type of coatings increased notably [60,[291][292][293][296][297][298][299]. Numerous techniques and methods have been used in the development of superhydrophobic surfaces [300][301][302], and the sol-gel process, as the versatile method that it is, was no exception [294,299,[303][304][305][306][307].…”

Section: Coatings With Superhydrophobic Functionmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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The corrosion process is a major source of metallic material degradation, particularly in aggressive environments, such as marine ones. Corrosion progression affects the service life of a given metallic structure, which may end in structural failure, leakage, product loss and environmental pollution linked to large financial costs. According to NACE, the annual cost of corrosion worldwide was estimated, in 2016, to be around 3%-4% of the world's gross domestic product. Therefore, the use of methodologies for corrosion mitigation are extremely important. The approaches used can be passive or active. A passive approach is preventive and may be achieved by emplacing a barrier layer, such as a coating that hinders the contact of the metallic substrate with the aggressive environment. An active approach is generally employed when the corrosion is set in. That seeks to reduce the corrosion rate when the protective barrier is already damaged and the aggressive species (i.e., corrosive agents) are in contact with the metallic substrate. In this case, this is more a remediation methodology than a preventive action, such as the use of coatings. The sol-gel synthesis process, over the past few decades, gained remarkable importance in diverse areas of application. Sol-gel allows the combination of inorganic and organic materials in a single-phase and has led to the development of organic-inorganic hybrid (OIH) coatings for several applications, including for corrosion mitigation. This manuscript succinctly reviews the fundamentals of sol-gel concepts and the parameters that influence the processing techniques. The state-of-the-art of the OIH sol-gel coatings reported in the last few years for corrosion protection, are also assessed. Lastly, a brief perspective on the limitations, standing challenges and future perspectives of the field are critically discussed.Polymers 2020, 12, 689 The development of OIH sol-gel coatings, based on siloxanes, for corrosion mitigation, has been widely studied in the last few years [2,31,[36][37][38]. Numerous studies have been conducted since the early 1990s [39,40]. The studies performed showed that siloxanes were effective in mitigating the corrosion processes of different metallic substrates. This development was mainly due to the need for alternative environmentally friend materials and processes to replace the traditional chromium-based pre-treatments. Hexavalent chromium (Cr (VI)) is carcinogenic and shows high environmental toxicity and its use has been forbidden since 2006. However, Cr(VI) based pre-treatments improve the coating adherence to the substrate and are effective corrosion inhibitors [41][42][43] which make its replacement challenging. The use of the sol-gel method to produce OIH coatings for corrosion mitigation suits the main requirements of what should be an environmentally friendly process (i.e., excludes washing stages; it is a waste-free method) and allows one to obtain coatings with high purity and specific pore volumes and surface areas. Since it is a mild synthesis...

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Section: Coatings With Superhydrophobic Functionmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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“…[1] Besides hydrophobicity, fluoropolymers have many other interesting properties, such as chemical inertness, thermal stability, low relative permittivity, lipophobicity, low friction coefficient. [2][3][4][5] Due to these properties, many applications such as coatings, microfiltration, microelectronics, antifouling, antiwetting and optics can be envisaged. [3,[6][7][8][9][10][11] It is therefore clear that the most significant property of fluoropolymers is their hydrophobicity which eventually leads to modified surface properties.…”

Section: Introductionmentioning

confidence: 99%

Modified Diblock Copolymer Bearing Fluoro Groups and Evaluation of its Hydrophobic Properties

Politakos

Kortaberría

Zalakain

et al. 2012

Macromolecular Symposia

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Summary:The major scope of the presented work is the characterization and evaluation of hydrophobicity of novel copolymers of the PS-b-PB 1,2 type, modified with perfluorooctanoyl chloride [PS: polystyrene, PB 1,2 : poly(butadiene) with 100% 1,2-microstructure]. Fluoro atoms in polymers can create hydrophobic surfaces with low surface energy. The fluorinated groups can migrate and possible orient in the outermost surface of the polymeric thin film. Characterization in the modified block copolymer was conducted with carbon nuclear magnetic resonance ( 13 C-NMR) and thermogravimetric analysis (TGA) to evaluate the structure. Contact angle measurements were also conducted to verify the hydrophobicity of the fluorinated copolymer. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to depict the structure of the material. The obtained results showed that indeed the fluorinated copolymer exhibits high hydrophobicity (low surface energy material) with significant structural differences from its precursor.

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“…The roughness and heterogeneity of the surface influence the gloss and the contact angle values. Messori et al 1. reported that the roughness and heterogeneity perturb the behavior of a drop of liquid and hinder the droplet motion.…”

Section: Resultsmentioning

confidence: 99%

“…Fluorinated polymers are preferred in the field of advanced coating systems due to their unique properties. Firstly, CF bond strength (116 kJ/mol) is higher than CH bond strength (99.5 kJ/mol) and for this reason fluorinated polymers exhibit unique thermal properties 1. CF bonds are always strongly polarized because of high electronegativity.…”

Section: Introductionmentioning

confidence: 99%

Preparation of fluorine containing hybrid coatings: investigation of coating performance onto ABS and PMMA substrates

Kahraman

Akdemir

Kartal

et al. 2011

Polymers for Advanced Techs

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UV‐curable fluorinated organic–inorganic hybrid coatings were prepared by the sol–gel technique. Perfluorinated urethane modified alkoxysilane was synthesized by the reaction between perfluoro alcohol and 3‐isocyanatopropyltrimethoxysilane. The prepared formulations were applied onto poly(methyl methacrylate) (PMMA) and acrylonitrile butadiene styrene (ABS) panels and polymerized by UV‐curing. The properties of the hybrid coatings such as hardness, chemical resistance, thermal stability, surface morphology, double bond conversion, and also contact angle measurements were investigated. Contact angle measurements have shown that the addition of fluorinated silane precursor to the hybrid system improved the water repellency and increased the contact angle from 65° to 106°. Copyright © 2009 John Wiley & Sons, Ltd.

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Fluorinated Copolymer-Oxide Hybrids

Cited by 6 publications

References 4 publications

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Modified Diblock Copolymer Bearing Fluoro Groups and Evaluation of its Hydrophobic Properties

Preparation of fluorine containing hybrid coatings: investigation of coating performance onto ABS and PMMA substrates

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