self healing coatings
DESCRIPTION
Final Presentation for CHEM466 Polymers Course at Texas A&M UniversityTRANSCRIPT
Self-Healing CoatingsA Case Study: Poly(DCPD)
Mohammed AlShammasiApril 11th 2012
Presentation Layout
• Introduction– Self-healing coatings– Structural schemes
• Synthesis• Characterization– Chemical properties– Mechanical properties
• Applications• Conclusion
Introduction> Self-healing Coatings
Smart Materials (stimuli: mechanical,
electrical, thermal, …)
Coatings (antifouling, antimicrobial,
conductive, ….)
Self-healing Coating Systems
Poly(dicyclopentadiene)/Grubbs’ catalyst system
• are characterized by: 1. Responsiveness
Introduction> Self-healing Coatings
Introduction> Self-healing Coatings
• are characterized by: 2. External stimuli
Introduction> Self-healing Coatings
• are characterized by: 3. Programmed structure
Intrinsic
Introduction> Structural Schemes
Capsule-based Microvascular
Synthesis> ROMP of DCPD
Synthesis> ROMP of DCPD
1. NMR
Characterization> Chemical Properties
2. UAS
Characterization> Chemical Properties
• Healing efficiencyCharacterization> Mechanical Properties
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
• SEM ImagesCharacterization> Mechanical Properties
Enhances product safety
Protects structural bodies
Reduces inspection costs
Applications> Benefits
• Benefits of using self-healing coatings:
Applications> Example: Military
• 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
THANK YOU!