Addition polymerisation:
In this type of polymerisation, a large number of molecules of same or different monomers simply add to the other unit, leading to the formation of macromolecule. Addition polymerisation generally occurs among molecules containing double and triple bonds.
Condensation polymerisation:
In this type of polymerisation two or more bifunctional molecules undergo a series of independent condensation reactions usually with the elimination of simple molecules like water, alcohol, ammonia etc.