Explain the classification of polymers based on the mode of polymerization and natural of molecular forces.

Explanation

On the basis of mode of polymerisation polymers are classified into two types:
1) Addition polymers
2) Condensation polymers.
1) Addition polymer: The polymer which is formed by the addition of molecules of monomers of same type (or) different type containing double bonds is called addition polymer.
E.g: Nylon 6,6 Poly Ethylene terephthalate.
2) Condensation polymer: The polymer which is formed by the condensation reaction between molecules having more than onr functional group is called condensation polymer.
E.g : Nylon 6,6 ,Poly ethylene terephthalate. On the basis of molecular forces polymers are classified into four types.
1) Elastomers : These are rubber like solides with elastic properties . E.g : Buna -S ,Buna -N
2) Fibres: Fibres are the thead forming solids which possess high tensile strength.
E.g : Nylon 6,6 ,polyesters.
Thermoplastic polymers: These are the linear (or) slightly branched long chain molecules capable of softening on heating and hardening on cooling . E.g : Polystyrene, polythene .
4) Thermo setting polymers : These polymers are cross linked (or) heavily branched molecules which on heating undergo extensive cross linking in moulds and again become infusible .
E.g : Bakelite,urea - formaldehyde resin etc ...