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Explain free radical polymerisation with example.

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1. When alkenes are heated with free radical initiator such as benzoyl peroxide, they undergo polymerisation reaction. For example, styrene polymerises to polystrene when it is heated with a peroxide initator. The mechanism involves the following steps.

2. Initiation – Formation of free radical.

3. Propagation step.

4. Chain growth will continue with the successive addition of several thousands of monomer units. 

5. Termination: The above chain reaction can be stopped by stopping the supply of monomer or by coupling of two chains or reaction with an impurity such as oxygen.

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