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CHEM - Condensation Polymer

Chemistry, condensation polymer, polyester - IGCSE | IBDP | DSE | GCE | IAL | AP Chemistry

· chemistry,condensation polymer,polymer,polyester

Condensation Polymer

  • Usually, two different types of monomers join to form condensation polymers.
  • During the reaction, a small molecule (for example, water) is released.
  • One example of condensation polymer is polyester.

Polyester

👇 Remember that an ester is formed when a carboxylic acid and alcohol react together 👇

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A polyester is formed from two different monomers:

  • a dicarboxylic acid, which contains two carboxylic acid groups (—COOH) 
  • a diol, which contains two alcohol groups (—OH) 
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☝️ The reaction to form a polyester from a dicarboxylic acid and a diol☝️

Notice that: 

  • Each monomer has functional groups on either end so that it can react and form ester links on both ends.
  • Dicarboxylic acid loses OH group from each carboxyl group (—COOH).
  • Diol loses H from each hydroxyl group (—OH).
  • The remaining molecules join together to form polyester, and OH and H form water.
  • The number of water molecules formed is twice the number of either monomer.

For example, a reaction between ethanedioic acid and ethanediol looks like this: 

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Biopolyester

Although most polyesters are non-biodegradable, specific types of polyesters called biopolyesters, are biodegradable. Then can be naturally decomposed by microbes after their intended use.

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