Triethylaluminium (C2H5)3Al and titanium tetrachloride(TiCl4) Condensation polymerization or step growth: Since each step produces a functionalized species and is independent of each other,this is called step groth. As,monomers with different functional groups are condensed,so, it is Condensation polymerization. e.g. Condensation between Hexamethylene-di-amine[ NH2-(CH2)6-NH2] and Adipic acid[HOOC-(CH2)4-COOH in Nylon-6,6.