Self-Healing Coatings Based on Linseed-Oil-Loaded Microcapsules for Protection of Cementitious Materials

Kim, Dong-Min; Song, Inho; Choi, Ju Chan; Jin, Seung-Won; Nam, Kyeong-Nam; Chung, Chan‐Moon

doi:10.3390/coatings8110404

Cited by 29 publications

(17 citation statements)

References 24 publications

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“…Schematic of corrosion self-healing mechanism with an OIH sol-gel coating containing nanocontainers loaded with corrosion inhibitors. Adapted from [37,233].…”

Section: Sol-gel Coatings With Self-healing 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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“…Schematic of corrosion self-healing mechanism with an OIH sol-gel coating containing nanocontainers loaded with corrosion inhibitors. Adapted from [37,233].…”

Section: Sol-gel Coatings With Self-healing Functionmentioning

confidence: 99%

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

Figueira

2020

Polymers

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“…In a study, linseed oil (LO) went through an oxidative drying procedure on exposure to air, forming a soft film [138] . After 48 h, the reaction conversion attained 88 % and 59 % at ambient temperature and 20 C, respectively.…”

Section: Self-healing Pnc Coatingsmentioning

confidence: 99%

“…20 (a). SEM image of LO microcapsules; (b) LO size distribution; SEM images of the scratched (c) control and (d) self-healing coatings [138] . …”

Section: Self-healing Pnc Coatingsmentioning

confidence: 99%

“…SH entities encapsulation potending sensitivity to external stimuli such as pH, moisture, light, or crack propagation is critical for inculcating functionalities capable of damage repair. Numerous coating systems included SH agents have been investigated [135] , [136] , [137] , [138] , [139] , [140] , [141] . A commonly studied smart coating system is urea formaldehyde microcapsules (UFMC) with encapsulation of varying inhibitors and SH agents incorporated into polymeric matrix [142] .…”

Section: Self-healing Pnc Coatingsmentioning

confidence: 99%

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Recently Emerging Nanotechnological Advancements in Polymer Nanocomposite Coatings for Anti-corrosion, Anti-fouling and Self-healing

Idumah

Obele

Emmanuel

et al. 2020

Surfaces and Interfaces

123

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“…This is the basic strategy adopted by many extrinsic self-healing materials. Other kinds of extrinsic self-healing materials are carried out or improved on this basis [14][15][16]. However, such a self-healing material can only be repaired once at a specific location.…”

Section: Introductionmentioning

confidence: 99%

A novel kind of room temperature self-healing poly(urethane-urea) with robust mechanical strength based on aromatic disulfide

Song

et al. 2021

J Polym Res

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An innovative poly(urethane-urea) elastomer, which exhibited excellent stretchability, thermal stability and autonomous self-healing abilities, was synthesized from the commercially available poly(propylene glycol) (PPG), isophorone diisocyanate (IPDI), 2,4 / 2,6-toluene diisocyanate (80: 20, w / w) (TDI-80) and bis (2-aminophenyl) disulfide (DSDA). This aromatic disulfide containing poly(urethane-urea) (ss-PUs) achieved both rapid room temperature self-healing abilities and robust mechanical strength (the ultimate tensile strength was up to 4.20 ± 0.10 MPa and elongation at break was up to 954 ± 35.6%), through facile metathesis of the aromatic disulfides which embedded in hard segments. After the ss-PUs was cut into two-halves and reconnected, the mechanical properties could recover to ~ 90% of those of the original samples within 12 h at room temperature without extra self-healing agents or any change of environmental conditions.

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Self-Healing Coatings Based on Linseed-Oil-Loaded Microcapsules for Protection of Cementitious Materials

Cited by 29 publications

References 24 publications

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

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

Recently Emerging Nanotechnological Advancements in Polymer Nanocomposite Coatings for Anti-corrosion, Anti-fouling and Self-healing

A novel kind of room temperature self-healing poly(urethane-urea) with robust mechanical strength based on aromatic disulfide

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