State and explain the terms :
Addition polymerisation

Explanation

Copolymerisation. Copolymerisation is a polymerisation reaction in which a mixture of more than one monomeric species is allowed to polymerise and form a copolymer. The copolymer can be made not only by chain growth polymerisation but by step growth polymerisation also. It contains multiple units of each monomer used in the same polymeric chain. For example, a mixture of 1,3-butadiene and styrene can form copolymer.

Copolymers have properties quite different from homopolymers. For example butadiene-styrene copolymer is quite tough and is a good substituie for natural rubber. It is used for the manufacture of autotyres, floortiles, footwear components, cable insulation etc.