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Self-Healing CoatingsA Case Study: Poly(DCPD)
Mohammed AlShammasiApril 11th 2012
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Presentation Layout
• Introduction– Self-healing coatings– Structural schemes
• Synthesis• Characterization– Chemical properties– Mechanical properties
• Applications• Conclusion
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Introduction> Self-healing Coatings
Smart Materials (stimuli: mechanical,
electrical, thermal, …)
Coatings (antifouling, antimicrobial,
conductive, ….)
Self-healing Coating Systems
Poly(dicyclopentadiene)/Grubbs’ catalyst system
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• are characterized by: 1. Responsiveness
Introduction> Self-healing Coatings
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Introduction> Self-healing Coatings
• are characterized by: 2. External stimuli
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Introduction> Self-healing Coatings
• are characterized by: 3. Programmed structure
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Intrinsic
Introduction> Structural Schemes
Capsule-based Microvascular
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Synthesis> ROMP of DCPD
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Synthesis> ROMP of DCPD
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1. NMR
Characterization> Chemical Properties
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2. UAS
Characterization> Chemical Properties
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• Healing efficiencyCharacterization> Mechanical Properties
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Material Structure scheme
Loading Conditions
Maximum healing efficiency (%)
Epoxy Microvascular Mode I four-point bend
38-70
Expoy/E-glass FRC Capsule-based Mode I DCB 60
Epoxy Capsule-based Mode I TDCB 75-93
Epoxy/embedded SMA wires
Capsule-based Mode I TDCB 77
Epoxy vinyl ester Capsule-based Mode I TDCB 30
Epoxy/carbon FRC Capsule-based Mode I WTDCB 80
Characterization> Mechanical Properties
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• SEM ImagesCharacterization> Mechanical Properties
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Enhances product safety
Protects structural bodies
Reduces inspection costs
Applications> Benefits
• Benefits of using self-healing coatings:
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Applications> Example: Military
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• Types of structural schemes for healable coatings:
1. Capsule-based
2. Microvascular
3. Intrinsic
• In poly(DCPD)/Grubbs’ coating system
– Polymerization via ROMP
– Chemical characterization through NMR and UAS
– Mechanical testing to examine healing efficiency
– Benefits are product safety, costs, and protection
– Has applications in military, auto, construction, ...
Conclusion
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THANK YOU!
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