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Polymerisation

Polymerisation. Objectives: Be able to describe how some products of cracking are turned into plastics. Create a model of polyermisation . Fractional Distillation. High temp. Catalyst. Cracking. alkane. alkene. shorter alkane. Thermal decomposition. Uses of alkenes.

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Polymerisation

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  1. Polymerisation Objectives: • Be able to describe how some products of cracking are turned into plastics. • Create a model of polyermisation.

  2. Fractional Distillation

  3. High temp Catalyst Cracking alkane alkene shorter alkane Thermal decomposition

  4. Uses of alkenes Plastics Ethanol

  5. Monomer Addition polymerisation Polymer

  6. Formation of plastics (polymers) • Many small molecules join together to form a larger molecule. • The small molecule or monomer is the alkene. • The large molecule is the polymer (plastics). • Mono = one • Poly = many • ‘Mer’ = unit • The process is called addition polymerisation.

  7. Model • A scientific model is a way to represent an idea.

  8. Create a model of polymerisation using the cut out molecules Once you have done that, in your books show how ethene is turned into polyethene

  9. Making polymers • The monomer ethene forms the polymer poly(ethene) or polythene.

  10. Match up the monomer to the polymer and its uses.

  11. Key question: What effects the properties of polymers? The monomer it is made from The conditions its made under

  12. HDPE – High density polythene • Made from ethene molecules using a catalyst at 50˚C. LDPE – Low density polythene • Made from ethene molecules using very high temperatures and a bit of oxygen.

  13. Below are some properties that polymers may have: Flexible Stretchy Hard-wearing Select 2 properties that it would be useful for the following uses. • Pair of tights • Dental fillings • Hiking jacket • Pan handle • Goldfish tank Non-conductor of heat Transparent Stiff Flexible Waterproof

  14. Plenary: With your partner.... Discuss: • One thing you’re confident about. • One thing you’re unsure about. • One thing you’d like to know.

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