Free-radical Addition

Step 1.

Initiation :

I is some source of free radicals, e.g. benzoyl peroxide or azobisisobutyronitrile, etc.

A is the monomer e.g. CH2=CH-R, where R = Ph, Cl, CN, etc.

 

Step 2.

Propagation :

Step 3.

Termination :

2 main routes:

Recombination:

Disproportionation:

Where IAn contains a double bond.