Polystyrene Polymerization Mechanism 

1. INITIATION, create free radical
2. PROPAGATION, free radical breaks open double bond of alkene
2b. PROPAGATION continues: this free radical breaks open double bond of a new molecule
2c. Continues as long as you want
3. TERMINATION, two free radicals combine and de-activate each other
Shout out to Assistant Professor Dr. Timothy Ramadhar at Howard University !
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