Polymerisation

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  • Created by: hjmahon16
  • Created on: 23-03-14 13:46
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  • Polymerisation
    • Polymerisation means loads of small molecules link together
      • Monomers join to make polymer
        • Usually carbon-based
        • Under high pressure
    • Lots of types of polymers
      • Involving different monomers
      • Strong, rigid
        • e.g. high density polythene
        • Used to make milk bottles
      • Light, stretchable
        • e.g low density polythene
        • Used for plastic bags & squeezy bottles
      • PVC is strong and durable
        • Can be made rigid or stretchy
          • Rigid: window frames & piping
          • Stretchy: Synthetic leather
      • Polystyrene foam
        • Used in packaging to protect breakable things
        • Trapped air makes them good thermal insulator
      • Heat resistant polymers
        • e.g melamine resin & polypropene
        • Used to make plastic kettles
    • Polymers have replaced natural materials
      • Synthetic fibres
        • e.g nylon & polyester
        • Replace cotton, wool or silk fabrics
        • Advantages
          • Lighter
          • More durable
          • Water resistant
          • Often cheaper
        • Disadvantages
          • Aren't breathable
      • Rigid PVC
        • Replace wood for window frames
        • Weather-resistant
        • Strong & durable
        • Frames don't need painting every few years

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