Self‐healing waterborne polyurethane coating by pH‐dependent triggered‐release mechanism

ABSTRACT In this study, effect of high‐loaded silica capsules with corrosion inhibitor on thermal degradation and self‐healing properties of waterborne polyurethane (WPU) was investigated. Silica capsules were synthesized using an oil in water (O/W) microemulsion and WPU was prepared via the prepoly...

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Bibliographic Details
Published in:Journal of applied polymer science 2019-02, Vol.136 (8), p.n/a
Main Authors: Mirmohseni, Abdolreza, Akbari, Morteza, Najjar, Reza, Hosseini, Mirghasem
Format: Article
Language:English
Subjects:
Adhesive strength
Barriers
Coating effects
Corrosion effects
corrosion inhibitor
Corrosion inhibitors
Corrosion mechanisms
Electrochemical impedance spectroscopy
Gravimetric analysis
Healing
Materials science
Morphology
pH triggered
Polymers
Polyurethane resins
Properties (attributes)
Scanning electron microscopy
self‐healing
silica capsule
Silicon dioxide
Substrates
Thermal degradation
waterborne polyurethane
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Summary:ABSTRACT In this study, effect of high‐loaded silica capsules with corrosion inhibitor on thermal degradation and self‐healing properties of waterborne polyurethane (WPU) was investigated. Silica capsules were synthesized using an oil in water (O/W) microemulsion and WPU was prepared via the prepolymer method. Assembled capsules demonstrated pH dependent release of their core. Incorporating silica capsule as an inorganic component resulted to improve thermal and barrier properties of WPU coatings. WPU coating with 1% silica capsules demonstrated better barrier quality in corrosive media and adding more than that resulted a rapid deterioration in barrier properties. Furthermore, such coatings possess an excellent adhesive strength with steel substrate. Electrochemical impedance spectroscopy was used in corrosion monitoring and healing procedure. Moreover, capsule morphology and thermal degradation of the WPU coating has been investigated separately by scanning electron microscopy and thermal gravimetric analysis. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47082.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.47082