anisah kabli ece 507 fall 2012 self-healing plastic
TRANSCRIPT
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Anisah KabliECE 507
Fall 2012
Self-Healing Plastic
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• Defining “Self-Healing”? • Structure of Plastic• Self-Healing Process• First uses of Self-Healing Plastics• Self-Healing Plastics Today• Benefits of Self-Healing Plastics• The Future of Plastic
Agenda
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What makes something self-healing?
• Ability to repair damage caused by mechanical usage over time. • Healing process occurs without human intervention
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• Rubber Tree• Releases a type of latex
• Rubber tapping
• Liana Plant• Base tissue cells expand
• Mussels• Heals bonding material
In Nature
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• Typically polymers derived from petrochemicals
• Polymers are chains of repeating atoms.
• Two parts:• The Backbone: main "path" linking repeat units together. • Side Chains: hang off backbone
• Allow the customization of plastics.
• The creation of polymers is called polymerization
Chemical Structure of Plastic
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• 3 step process:1. Triggering after damage2. Transport of materials 3. Chemical repair process
• Requires an external stimulus to initiate healing• Energy is introduced into the system to allow repolymerization
to take place.
The Self-healing Process
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• 2005 – Nissan• Nissan “Scratch Guard”
• Polymer capsules & chitosan
• Only repairs once
• 2008 – Automatic Materials of Champaign, IL• Protective coatings against rust
• Polymer capsules and catalyst
• January 2012 – Nissan• Self-Healing iPhone Case- Scratch Shield paint
First Uses of Self-Healing Plastics
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• March 2012 - University of Southern Mississippi• Bleeding Plastic
• Release warning red dye• Heals with sunlight, artificial light, pH or temperature changes• Able to repeatedly heal itself• Environmentally Friendly - water-based polymers
Self-healing Plastics Today
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• November 2012 - Stanford University• Plastic “Skin”
• Polymer mixed with nickel. • Polymer: Weak bonds. Nickel: Conductivity• Nickel creates an electric current
• Resistance determines shape of skin and pressure
Self-Healing Plastic Today
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Benefits• Save Money
• lower production costs • longer part lifetime, • reduction of inefficiency and material failure.
• Reusability• minimize upkeep and repair• saving consumers money and reducing waste
• Ex: Sheathe electronics , nail polish, cars
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• Improve Safety• Bleeding material act as warning system
• flag damage on aircraft structures• Cracks in bridges, • Failings in battlefield weapon systems
• Medical Uses• Restore sense of touch to prosthetics
Benefits
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• Self-healing plastics withstand high temperatures• Make the self-healing skin elastic• Flexible but not stretchable
• Terminator?
Future
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Thanks!
Questions?
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References
• http://www.technologyreview.com/news/411364/first-self-healing-coatings/?a=f
• http://bgr.com/2012/01/17/nissan-announces-the-worlds-first-self-healing-iphone-case/
• http://www.gizmag.com/self-healing-car-paint/11254/• http://www.sciencedaily.com/releases/2011/09/110923102217.htm• http://inhabitat.com/scientists-create-artificial-plastic-skin-that-bleeds-
and-heals-itself/• http://news.cnet.com/8301-17938_105-57405944-1/new-breed-of-plast
ic-bleeds-heals-itself/• http://www.gizmag.com/bleeding-plastic/21958/• http://www.popsci.com/technology/article/2012-03/new-plastics-bleed-
red-when-scratched-then-heal-themselves-skin• http://www.popsci.com/science/article/2012-11/stanford-researchers-cr
eate-self-healing-synthetic-skin-sensitive-touch• http://news.sciencemag.org/sciencenow/2012/11/self-healing-plastic-
skin-points.html