04_polymer_1_6_f

04_polymer_1_6_f - 2.008 Design & Manufacturing II Spring...

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1 1 2.008 Design & Manufacturing II Spring 2004 Polymer Processing I -What is polymer? -Polymer Science 2.008 spring 2004 S. Kim 2 Plastics ± $120 Billion shipments, 1999 US ± One of the greatest inventions of the millennium – Newsweek ± Music LPs, CDs ± No-sticking TEFLON ± Stre-e-e-tching SPANDEX ± Applications Name it 2.008 spring 2004 S. Kim 3 Plastic Intensive Vehicles Corvette Lotus 2.008 spring 2004 S. Kim 4 Automotive Plastics and Composites Use ± Exterior ± doors ± hoods ± fenders ± bumper covers (most cars have soft fascia) ± Interior ± instrument panels, door trim, seats, consoles ± Engine ± valve covers, intake manifolds, fluid containers, etc. 2.008 spring 2004 S. Kim 5 Recreational Plastics and Composites Use ± Snow Equipment ± skis, snow boards, snow mobiles, etc. ± Water Sports Equipment ± water skis, water crafts, snorkel equipment, fishing gear ± diving equipment and clothes ± Land Sports Equipment ± shoes, roller blades, skate boards, tennis, golf, etc. 2.008 spring 2004 S. Kim 6 Commercial Plastics Usage ± Packaging ± Wrapping, bags, bottles, foams, shrink wrap. ± Textiles ± Clothing, carpets, fabrics, diapers, netting for sports ± Furniture, Appliances, House wares ± Telephones and other communication equipment, computer housings and cabinets, luggage, seating, components for washers, dryers, etc. ± Musical instruments, CDs, VCRs, TVs, cases ± Construction ± Moldings, counter tops, sinks, flooring, cups, paints, etc. ± Tyvek
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2 2.008 spring 2004 S. Kim excerpt from Prof. J. Greene, CSU 7 Medical Plastics and Composites Use ± Containers ± Bottles, bags ± Drug delivery ± IV bags, syringes ± tubing and tools for surgery ± Implants, artificial skins ± The use of plastic materials in the medical field, about 4 billion dollars in 2000 (US). 2.008 spring 2004 S. Kim 8 Materials Solid materials metals ceramics Plastics thermoplastics thermosetts elastomers Plastic: Greek, plastikos , means to form or mold 2.008 spring 2004 S. Kim 9 Plastics, Polymers, Macromolecules ± Poly (many) + mer (structural unit) -[C 2 H 4 ] n - ,poly[ethylene] ± Metal: single atoms, metallic bond ± Ceramic: metallic oxides, ionic bond or dipole interactions, van der Waals bonds HH CC spaghetti 2.008 spring 2004 S. Kim 10 2.008 spring 2004 S. Kim 11 Thermoplastics amorphous crystalline Transparent Translucent Opaque 2.008 spring 2004 S. Kim 12 Crystalline vs. amorphous ± Crystals, lamella structure ± Degree of crystallinity ± Translucent/opaque
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3 2.008 spring 2004 S. Kim 13 Amorphous vs. Semi crystalline Polymers Tg Tg+60°C Glassy solid Rubbery Melt V ˆ Tg Tm Brittle Tough and flexible Melt V ˆ (a) (b) 2.008 spring 2004 S. Kim 14 Early Plastics •Phenolics (named Bakelite by Leo Bakeland) –Resin could be shaped and hardened with heat –Phenol and formaldehyde reaction after heat –Replacement for shellac, natural plastic (1907) •Nylon66 - W. H. Carothers of DuPont (1920’s) •PVC - W. Semon of B.F. Goodrich (1929) 2.008 spring 2004 S. Kim 15 Polymers ± PE (Polyethylene)-Crystalline ± PVC (Polyvinyl chloride)-Amorphous ± PP (Polypropylene)-C ± PS (Polystyrene)-A ± PU (Polyurethane)-Thermoset ± PET (Polyethyleneterephthalate)-C ± PPO (Polyphenyleneoxide)_A ±
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This note was uploaded on 02/23/2012 for the course MECHANICAL 2.008 taught by Professor Jung-hoonchun during the Spring '04 term at MIT.

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04_polymer_1_6_f - 2.008 Design & Manufacturing II Spring...

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