Polymers Prof. David Roylance Department of Materials Science and Engineering MIT/DMSE Advice to Benjamin Braddock, 1967: “I’ve got one word for you, my.

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Presentation transcript:

Polymers Prof. David Roylance Department of Materials Science and Engineering MIT/DMSE Advice to Benjamin Braddock, 1967: “I’ve got one word for you, my boy: …”

MIT/DMSE Plastics, my boy...

MIT/DMSE

Some polymer history – ca 1492Columbus (Priestly ca 1800) ca 1839 Goodyear/Hancock ca 1930 Staudinger/Carouthers ca 1953 Watson/Crick ca 1955 Ziegler/Natta ca 1970Kwolek

MIT/DMSE The Polymeric Solid State Blow-molded HDPE milk bottle (recyclable) Semicrystalline microstructure Covalently-bonded long-chain hydrocarbon

MIT/DMSE Stiffness vs. Temperature

MIT/DMSE Molecular Orientation and Strength

MIT/DMSE Polyamides Carouthers: nylon 66 Kwolek: aramid

MIT/DMSE Kevlar Fibers – a polyaramid

MIT/DMSE Modern Lightweight Personnel Armor

MIT/DMSE Panel and Bullet After Impact

MIT/DMSE Strain and Displacement in Fabric Layer

MIT/DMSE V s -V r Plot – Kevlar 29, Single Layer

MIT/DMSE Influence of Strength and Stiffness on V 50

MIT/DMSE

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