Sunlight‐Activated Self‐Healing Polymer Coatings

Odarczenko, Michael T.; Thakare, Dhawal R.; Li, Wenle; Venkateswaran, Sai P.; Sottos, Nancy R.; White, Scott R.

doi:10.1002/adem.201901223

Cited by 33 publications

(19 citation statements)

References 46 publications

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“…The results reveal that IE up to 70% is obtained with 10 wt% butyne di-OTMS microcapsules in a pH 4, 5 wt% salt solution. This IE is within the higher range of previously reported inhibition values (30-90%) [41,[46][47][48] generally achieved via encapsulation of anticorrosive actives. However, a direct comparison of IE is not suitable since IE is a function of pH, damage volume and microcapsule concentration [41] which tend to vary drastically across different studies.…”

Section: The Underlying Inhibition Mechanism Of Corrosion Of Steel Insupporting

confidence: 87%

Acid‐Responsive Anticorrosion Microcapsules for Self‐Protecting Coatings

Thakare

Xiong

Flueck

et al. 2022

Macro Chemistry & Physics

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Encapsulated anticorrosion agents provide a suitable alternative to dispersion of metal-based compounds in protective polymericcoatings on metal substrates. Stimuli-responsive microcapsules enhance protection abilities by autonomously responding to corrosion-induced environmental changes, rather than relying on damage-induced mechanical stimuli. This work reports pH-responsive microcapsules with triggered release over a wide range of acidic pH values (pH < 6) and robust enough to be incorporated in commercial solvent-based epoxy coatings. The pH responsiveness is achieved by integrating acid labile ketals that undergo rapid hydrolysis within the cross-linked polyamide shell and readily release acetylenic diol or jojoba oil as the anticorrosive agent. The microcapsules are stable up to a temperature of 150 °C and provide long-term room temperature stability up to 3 months. Degradation and release kinetics of the microcapsules are quantified at various pH levels (1 ≤ pH ≤ 9) using 1 H NMR and gas chromatography, respectively. Microcapsules exhibit complete release in under 5 min at pH 1 and ≈2 hours at pH 5, respectively. Coating performance is evaluated by electrochemical corrosion tests conducted in 5 wt% salt solutions with varying pH and concentration of the microcapsules in the coating. Inhibition efficiencies up to 70% are achieved in acidic saltwater solutions.

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Section: The Underlying Inhibition Mechanism Of Corrosion Of Steel Insupporting

confidence: 87%

Acid‐Responsive Anticorrosion Microcapsules for Self‐Protecting Coatings

Thakare

Xiong

Flueck

et al. 2022

Macro Chemistry & Physics

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“…There are several reports on the preparation of self-healing antiicing materials, [11,20,24] which have higher ice adhesion strength (40-60 kPa) than present reports. [5,10,25] There are extrinsic self-healing and intrinsic self-healing materials, [26,27,28,29] respectively. The extrinsic self-healing materials achieve self-repairing properties through releasing the self-healing agent into crack interfaces.…”

Section: Introductionmentioning

confidence: 99%

Novel Intrinsic Self‐Healing Poly‐Silicone‐Urea with Super‐Low Ice Adhesion Strength

Chen

Luo

et al. 2022

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Accumulation of snow and ice often causes problems and even dangerous situations for both industry and the general population. Passive de‐icing technologies, e.g., hydrophobic, liquid‐infused bionic surfaces, have attracted more and more attention compared with active de‐icing technologies, e.g., electric heating, hot air heating, due to the passive de‐icing technology's lower energy consumption and sustainability footprint. Using passive de‐icing coatings seems to be one of the most promising solutions. However, the previously reported de‐icing coatings suffer from high ice adhesion strength or short service life caused by wear. An intrinsic self‐healing material based on poly‐silicone‐urea is developed in this work to address these problems. The material is prepared by introducing dynamic disulfide bonds into the hard phase of the polymer. Experimental results indicate that this poly‐silicone‐urea has a self‐healing efficiency of close to 99%. More interestingly, it is found that the coating prepared from this poly‐silicone‐urea has a super low ice adhesion force, only 7 ± 1 kPa, which is almost the lowest value compared with previous intrinsic self‐healing de‐/anti‐icing reports. This material can maintain low ice adhesion strength after healing. This intrinsic self‐healing poly‐silicone‐urea can meet several practical applications, opening the door for future sustainable anti‐/de‐icing technologies.

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“…11,12 Recyclable/reprocessable thermoset polymers have emerged over the past few years to acquire reliable reprocessing through simple and efficient mechanisms. 13,14 In particular dynamic covalent exchange promoted thermoset materials were demonstrated with recycling and self-healing behavior, [15][16][17][18][19][20] where during reprocessing promising associative exchange results in a concurrent exchange between chains, as introduced by Leibler and coworkers. 21 The reported epoxy vitrimers execute associative exchanges through trans-esterication reactions, and the role of catalysts in exchange reactions was investigated thoroughly.…”

Section: Introductionmentioning

confidence: 99%