1. 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: …”

2. MIT/DMSE Plastics, my boy...

3. MIT/DMSE

4. 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

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

6. MIT/DMSE Stiffness vs. Temperature

7. MIT/DMSE Molecular Orientation and Strength

8. MIT/DMSE Polyamides Carouthers: nylon 66 Kwolek: aramid

9. MIT/DMSE Kevlar Fibers – a polyaramid

10. MIT/DMSE Modern Lightweight Personnel Armor

11. MIT/DMSE Panel and Bullet After Impact

12. MIT/DMSE Strain and Displacement in Fabric Layer

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

14. MIT/DMSE Influence of Strength and Stiffness on V 50

15. MIT/DMSE