Specification Point 4.45:
Understand how to draw the repeat unit of an addition polymer, including Poly(ethene), Poly(propene), Poly(chloroethene) and Poly(tetrafluoroethene)

Drawing Repeating Units

Polymer molecules are very large compared with most other molecules, so repeat units are used when displaying the formula:

  • Change the double bond in the monomer to a single bond in the repeat unit.
  • Add a bond to each end of the repeat unit.
Drawing repeating units, CIE IGCSE Chemistry

The concept of drawing a repeat unit of a monomer

Repeat units of addition polymers:

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Author: Jamie

Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.