Polymers are defined as high molecular mass micromolecules, which consist of repeating structural units derived from the corresponding monomers.
In the presence of an organic peroxide initiator, the alkenes and their derivatives undergo addition polymerization or chain growth polymerization through a free radical mechanism. Polythene, Teflon, orlon, etc., are formed by addition polymerization.
Condensation polymerization reactions shown by the interaction of bi- or poly functional monomers containing –NH2, -OH and –COOH groups. Condensation polymerization progresses through step by step and is also called step growth polymerization.
A mixture of two unsaturated monomers exhibits copolymerization and forms a co-polymer containing multiple units of each monomer.