Tensile plastic quiz - 1 What are plastics Give an example Plastics are synthetic organic polymers capable of being molded or formed used in different

Tensile plastic quiz - 1 What are plastics Give an example...

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1. What are plastics? Give an example Plastics are synthetic organic polymers capable of being molded or formed used in different applications. Example : PVC, Epoxy, ABS 2. Define Homopolymer, Heteropolymer, and teropolymer Homopolymer: only one monomer is used Heteropolymer: a polymer formed when two or more different types of monomer are linked in the same polymer chaing Teropolymers: exactly three monomers used 3. Give 2 differences between thermoplastics and thermoset plastics thermoplastics: soften when heated and harden when cooled, process is reversible thermoset:harden when heated, irreversible process 4. Mention at least 3 methods of processing plastics injection molding, compression molding, extrusion, blow molding, casting 5. Why is it important to know the glassy transition temperature of a plastic? below temper of transition plastics will be brittle, above temperature plastics will be ductile 6. Define crazes and how does it increase ductility?
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Unformatted text preview: crazes are regions of localized plastic deformation which lead to microvoids, as crazes increase the stresses will be distributed over a larger volume, meanin no force peaks 7. What are 2 advantages of plastics? good electrical insulation, good thermal insulation, high specific strength, can be recycled, low density, can be opaque 8. What are 2 disadvantages of plastics? low toughness, less resistance to abrasion, can produce hazardous fumes when burned, can no be used in high temperature applications All plastics are polymers but all polymers are not plastics T Plastics have high melting points F Plastics have high specific strength T Plastics are more ductile compared to metals T Most of the plastics are biodegradable F High molecular weight produces stronger polymers T Polymers are not found in nature F "Mer" means molecule F...
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  • Spring '14
  • BabakMinaie
  • Polymer, homopolymer, Heteropolymer

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