What are addition and condensation polymerisation? Give one example of each.

Explanation

When same of different monomoer molecules (unsaturated compounds ,e.g alkenes, alkadienes and their derivatives ) successively add together on a large scale to form a polymer ,then this type of polymerisation is known as addition polymerisation .Due to this successive is known as addition polymerisation .Due to this successive addition , there is an increase in the chain length or chain growth due to the formation of either free radicals or ionic species .e.g . polythene .

Condensation polymerisation onvolves the repetitive condensation reaction between two different bi - functional or tri -functional monomers .Some simple molecules like water , alcohol etc. are lost in these polycondensation polymers are formed. Since , the product of each step is again a bi - functional species , the product of each step is again a bi - functional species which is independent of each other and the sequence of condensation goes on , this process is completed in stepwise manner hence , also called step growth polymerisation e.g , terylene ,nylon 6, 6 etc.