21st June 2012 Polymerisation

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Presentation transcript:

21st June 2012 Polymerisation AIM – to explain how the properties of alkenes allow polymerisation

Key words monomer – one unit in a chain polymer – many units joined together

Poly(ethene) (polythene or polyethylene) This is an example of addition polymerisation. During the polymerisation of ethene, thousands of ethene molecules join together to make poly(ethene) - commonly called polythene.

Poly(propene) (polypropylene): PP

In an equation form, this is normally written as:

Poly(chloroethene) (polyvinyl chloride): PVC Poly(chloroethene) is made by polymerising chloroethene, CH2=CHCl.

The equation is usually written It doesn't matter which carbon you attach the chlorine to in the original molecule. Just be consistent on both sides of the equation.

Poly(tetrafluoroethene): PTFE You may have come across this under the brand names of Teflon or Fluon. PTFE is just like poly(ethene) except that each hydrogen in the structure is replaced by a fluorine atom.