Condensation Polymerization

Condensation polymers are any kind of polymers formed through a condensation reaction where molecules join together–losing small molecules as by-products such as water or methanol.

en.wikipedia.org/wiki/Condensation_polymer

Example – converting ethylene terephthalate to polyethylene

Step 1: Draw two different monomer molecular structure
MOLECULE A AND MOLECULE B

Condensation Polymerization - Making Plyesters or PET

ester-linkageThis pretty symbol you see is called an ester linkage formed by combining acid and an alcohol. You don’t have to worry about it, Ā just draw it in šŸ™‚

Step 2: Combine the monomers and remove the water moleculeĀ 
The combination produces a water molecule
CONDENSATION-POLYMERIZATION-PET

Step 3: String the molecules together without the water

Make a continuous string of molecules, below shows an example of 2 molecules linked together.
CONDENSATION-POLYMERIZATION-PET1

Step 4: Make polymer with Nth term

You can join lots of molecules together and keep repeating the structure.
CONDENSATION-POLYMERIZATION-PET4

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