Free-radical mechanism : Free-radical polymerisation is initiated by organic peroxide or other reagents which decompose to give free radicals. Given steps are defined.

         (a) Chain initiation : Organic peroxides undergo homolytic fission to form free radicals.

         (b) Chain propagation : Free radical includes to an alkene molecule to form a new free radical.

         The free radical created attacks another alkene molecule and the process continues in building a long chain.

         (c) Chain termination : The chain reaction comes to halt when two free radical chains combine.

         q t-Butyl peroxide or Benzoyl are common initiators, used.

Free radical polymerisation may also be started by a mixture of ferrous sulphate and hydrogen peroxide (FeSO₄+H₂O₂).

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