Self-healing epoxy coatings with enhanced properties and facile processability

Self-healing coatings are endowed with the ability of self-repair upon damage, thus enhancing their life-time. However, limited by the complex chemistry and composition design, the reported self-healing coatings have processing difficulties and undesired low mechanical properties. This work presents...

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Bibliographic Details
Published in:Polymer (Guilford) 2018-07, Vol.147, p.196-201
Main Authors: Yuan, Dian, Bonab, Vahab Solouki, Patel, Ammar, Manas-Zloczower, Ica
Format: Article
Language:English
Subjects:
Coatings
Corrosion tests
Crack closure
Cracks
Electrochemical corrosion
Electrochemistry
Epoxy
Epoxy coatings
Mechanical properties
Molecular weight
Morphology
Organic chemistry
Polycaprolactone
Polymerization
Polymers
Polyurethane
Polyurethane prepolymer
Polyurethane resins
Prepolymers
Processability
Self healing materials
Self-healing coating
Shelf life
Transparency
Urethane thermoplastic elastomers
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Summary:Self-healing coatings are endowed with the ability of self-repair upon damage, thus enhancing their life-time. However, limited by the complex chemistry and composition design, the reported self-healing coatings have processing difficulties and undesired low mechanical properties. This work presents a self-healing epoxy coating system obtained by simply blending a commercial epoxy with a series of different molecular weight thermoplastic polyurethane (TPU) prepolymers. These systems display phase separated morphology induced through polymerization. They show extended shelf-life in comparison with the reported epoxy-polycaprolactone (PCL) self-healing system and comparable processing window with the commercial epoxy coatings. These coatings show remarkable transparency and mechanical properties by comparison with the epoxy-PCL system and fast healing performance with crack closure upon heating at 80 °C in 10 min. Moreover, the resultant closed crack undergoing the electrochemical corrosion test exhibits effective barrier behavior. [Display omitted] •Epoxy-TPU prepolymer coating systems show extended shelf-life and shorten processing window in comparison with the reported epoxy-PCL system.•These coatings show remarkable transparency and mechanical properties by comparison with the epoxy-PCL system.•Fast healing performance was achieved with crack closure upon heating at 80 °C in 10 min.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2018.06.017