Polymers

An overview of polymers including addition and condensation polymerisation.

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  • Polymers
    • addition polymerisation
      • alkenes are produced by cracking. (eg ethene)
        • these are called monomers
      • monomers can be added together in the right conditions to form very long molcules (polymers)
        • right conditions include: high pressure and  high temperature.
      • Shown using displayed formula
    • Uses
      • poly(ethene)
        • low density
          • plastic bags
        • high density
          • plastic bottles
      • poly(propene)
        • ropes and crates
      • poly(chloroethene) (PVC)
        • drainpipes, windows, floorings and clothing.
      • Nylon
        • textiles, rope and machine bearings
    • Condensation polymerisation
      • When 2 monomers join a small molecule is made and lost.
        • eg- water is made and lost
      • This is how nylon is made
      • needs 2 different types of monomer joining together alternatively.
      • Uses the 'block diagram'
        • one of the monomers is a rectangle with  -COOH group at either end.
          • The other monomer is pictured as a rectangle with a -NH2 group at either end.
            • Those end groups are drawn with displayed formula.
              • Having removed the water molecules slot the remaining molecules together.

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