Cationic mechanism : Cationic polymerisation is initiated by use of acids such as H₂SO₄ H₂SO₄, HF or BF₃ in H₂O. The following steps are involved :

         (a) Chain initiation : The acid furnishes proton.

         The proton includes to the carbon of the double bond of the alkene to form a carbonium ion.

         (b) Chain propagation : The carbonium ion combines with another molecule of alkene to form a new carbonium ion and the process continues to form a long chain.

         (c) Chain termination : The chain may be halted by combination with negative ion or loss of a proton.

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