Specification Point 4.49C (Paper 2C Only):
Understand how to write the structural and displayed formula of a polyester, showing the repeat unit, given the formulae of the monomers from which it is formed including the reaction of Ethanedioic acid and Ethanediol

Condensation Polymerisation

Polyester: A condensation polymer formed by the reaction between a dicarboxylic acid with a dialcohol. Both monomers must have two functional groups.

Condensation polymerisation: A reaction in which two different types of monomer join together to produce a polymer and expel a small molecule such as water.


The condensation polymerisation between terephthalic acid and ethane -1,2 diol

Polyester Structural & Displayed Formula

Polyester structure, Edexcel IGCSE Chemistry

The basic structure of a polyester, the box represents any group of atoms


Equation of condensation polymerisation of dicarboxylic acid and dialcohol to form a polyester

Reaction of Ethanedioc Acid and 1,2-Ethanediol

Reaction of ethanedioc acid and 1,2-ethanediol, Edexcel IGCSE Chemistry

Equation of the reaction between ethanedioc acid and 1,2-ethanediol

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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.