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Anionic polymerization is a type of chain-growth polymerization in which the initiation takes place by the anions.

This type of polymerization includes living polymerization techniques that allow control of polymer structure and its composition.

The anionic polymerization of 2-ethyloxirane results in the opening of the oxirane ring. The oxygen atom present in the oxirane ring gets hydrogen and it becomes a hydroxy-functional group.

The hydroxyl functional groups are present at the ends of the polymer chain. The oxygen atoms along with ethyl groups keep on repeating several times. The polymerization reaction is shown below:

Anionic polymerization of 2-ethyloxirane

The oxygen atom present in the oxirane ring gets hydrogen and thus it becomes a hydroxy (OH) functional group. Hydroxy-functional groups are present at the ends of the polymer chain.

Oxygen atoms along with the cyclohexane ring keep on repeating several times. The polymerization reaction is shown below.

Anionic polymerization of 1-oxaspiro[2.5]octane