chemistry 2

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  • Created by: Evie
  • Created on: 20-01-13 09:29
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  • chemistry 2
    • polymers
      • thermosoftt
        • no crosslinks - easy to melt
        • individual tangled chains
          • weak layers - slide over eachother
      • thermosetting
        • dont soften when heated
        • strong crosslinks
          • rigid structure
    • nanoparticles
      • 1-100nm across containing a few hundred atoms
      • fullerenes - molecules of carbon
      • nanoscience
        • large surface area:volume ratio = make good catalysts
        • stronger lighter building materials
    • polyethene
      • LD= low density polyethene
        • heat ethene at 200 degrees at high temperatures
      • HD = high density polyethene
        • heat ethene at lower temperatures and pressure
    • smart materials
      • nitinol = nickel and titanium
        • cools = bend
        • heat up = remembered shape

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