( iii ) Anionic polymerisation It involves formation of a carbanion , Steps involved in this process are
Step I Initiation Strong bases act as initiator .
Step Growth Polymerisation
Condensation polymerisation which occurs in a stepwise manner with elimination of some smaller molecules like H2O , NH3 , HCI , ROH , etc ., is concerned with step growth polymerisation , e . g ., adipic acid and hexamethylenediamine phenol and formaldehyde etc ., undergo step Growth Polymerisation .
Distinction Between Chain Growth Polymerisation and Step Growth Polymerisation