MatSci 101 2nd midterm prep 11(1)

MatSci 101 2nd midterm prep 11(1) - The scientific method...

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The scientific method Engineering design Materials science and engineering Materials processing Primary bonding—metallic, ionic, covalent Secondary bonding—hydrogen, van der Waals Steel: austenite ( FCC ), ferrite ( BCC ), cementite ( Fe 3 C ), pearlite ( layers of Fe 3 C ), martensite ( highly distorted form of BCC iron, hard, very brittle, very fast cooling rate ) Shape Memory Alloys ( NiTiNol = 50% nickel, 50% titanium, disovered at Naval Ordinance Laboratory ) Bonds in polymers Basic “mers”—PE, PVC, polyvinylidene chloride, PP, PS, PTFE ( Teflon, used in atomic bombs ) Types of polymers Addition polymerization (initiation, propagation, termination) – Dominoes Condensation polymerization (bifunctional, trifunctional or higher mers) - Zipper Polymer architecture (thermoplastics, elastomers, thermosets) Why polymers are weak – weak Van der Waals bonding between chains Ways to strengthen polymers (increase chain length, crystallization, cross- linking, chain stiffening) Steric hindrance
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This note was uploaded on 01/19/2012 for the course MAT SCI 101 taught by Professor Thomasmason during the Spring '11 term at Northwestern.

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MatSci 101 2nd midterm prep 11(1) - The scientific method...

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