Moisture-triggered self-healing of a polyurethane coating based on isocyanate–oxazolidine-loaded microcapsules synthesized via thiol-ene photopolymerization without CO2 release

The evolution of responsive polymers has amplified expressively in consequence of the growth of precise polymer architecture with predetermined structure-to-property behavior. In this study, new thermal responsive self-healing polycaprolactone urethane coatings were prepared from waste palm cooking oil. Nine different formulations of coatings with various percentages of ε-caprolactone (ε-CL) were successfully developed and the effect of polycaprolactone network in the polyurethane coating on the self-healing behavior. The remendability of the coatings was studied by using thermal analysis and dynamic mechanical analysis. The PCLU coating with the highest content of PCL network was nearly completely healed after 2 hours at 90ºC. The results were confirmed by scanning electron microscopy before and after healing. The mechanism of scratch closure by thermal stimuli-responsive self-healing was also discussed.

Download Full-text

UV-curable self-healing polyurethane coating based on thiol-ene and Diels-Alder double click reactions

Progress in Organic Coatings ◽

10.1016/j.porgcoat.2019.105282 ◽

2019 ◽

Vol 137 ◽

pp. 105282 ◽

Cited By ~ 7

Author(s):

Zhengyue Wang ◽

Hongbo Liang ◽

Haitao Yang ◽

Lei Xiong ◽

Jianping Zhou ◽

...

Keyword(s):

Diels Alder ◽

Self Healing ◽

Polyurethane Coating ◽

Uv Curable ◽

Click Reactions

Download Full-text

Self-healing and corrosion performance of polyurethane coating containing polyurethane microcapsules

10.21203/rs.3.rs-348120/v1 ◽

2021 ◽

Author(s):

Hanieh Fathi Fathabadi ◽

Mehdi Javidi

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Interfacial Polymerization ◽

Electrochemical Impedance ◽

Steel Substrate ◽

The Self ◽

Self Healing ◽

Polyurethane Coating ◽

Healing Efficiency ◽

Scanning Electron

Abstract In this study, the self-healing behavior of the polyurethane coating containing polyurethane microcapsules was investigated. Microcapsules, with the average size of 99 µm and shell thickness of 11 µm, were successfully synthesized via the interfacial polymerization technique and were incorporated into the polyurethane coating matrix. The electrochemical impedance spectroscopy and scanning electron microscope were employed to investigate the healing performance and corrosion behavior of the coatings on the carbon steel substrate. The recorded results revealed that artificial scratches were successfully healed and the coating containing 20 wt% microcapsules exhibited the best healing performance (85% healing efficiency) among all the prepared coatings. The self-healing ability of the coatings were verified via scanning electron microscope. After 24 hours, the healing efficiency attained a reasonable value of 68% during exposure to test solution. It was found that corrosion resistance and coating adhesion were significantly improved by incorporating the microcapsules into the coating.

Download Full-text