self healing coatings

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!