Chapter 14-15 - Part V: Plastics in Everyday Applications...

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Part V: Plastics in Everyday Applications Chapters 14,15.
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Examples of Plastics PS : Polystyrene. • Amorphous structure • Glass-clear, hard, brittle, and dimensionally stable • A disadvantage is its low thermal stability Polystyrene Micro plates Clean sheets Polystyrene bowls PE-LD : Low Density Polyethylene. • Very good flexibility, good general chemical resistance • Temperature of use is limited to about 80 ° C. LDPE bottles LDPE tubing collapsible Cubitainer PE-HD: High Density Polyethylene. • More compact structure, more rigidity, an enhanced chemical resistance • Usability at higher temperatures up to 105 ° C. Eco funnel HDPE bottles HDPE helmet PVC : Vinyl chloride polymers. • Mainly amorphous thermoplastics with very good chemical resistance •Good chemical resistance, especially against oils. Flexible PVC Pipe PVC foam board PVC Fitting headlamp enclosures
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What you should understand by the end of this chapter: How polymers are constructed from hydrocarbon molecules. How polymers are characterized in terms of chain length and molecular weight . The various structural forms that polymer chains can take. The difference between thermoplastics and thermosets . The nature of crystallinity in polymers. The mechanical properties of polymers.
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Natural Polymers Polymers are common in nature. They are nature’s building materials: Examples include: Wood, rubber, leather, silk, and so on.
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Synthetic Polymers Only recently have we become able to manufacture polymers artificially. Examples include: nylon, vulcanized rubber, Kevlar fibers, epoxy, polystyrene. .. Rainwear Kevlar Vest
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The numbers inside the arrows on every plastic product tell you what polymer it is. 1. poly(ethylene terephthalate) ( PET ) - plastic bottles 2. high-density polyethylene ( HDPE ) - plastics of all kinds, high-strength fibers 3. poly(vinyl chloride) ( PVC ) - water pipes, LP records, vinyl car tops 4. low-density polyethylene ( LDPE ) - plastic films, bags 5 . polypropylene ( PP ) - fibers for rope, indoor-outdoor carpeting 6. polystyrene ( PS ) - rigid plastics of all kinds, polystyrene foams 7. other, including items made from more than one kind of polymer
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This note was uploaded on 03/03/2011 for the course MATLS 101 taught by Professor Dr.kish during the Spring '11 term at McMaster University.

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Chapter 14-15 - Part V: Plastics in Everyday Applications...

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