Answer :

1. Classification of polymers:

(i) Naturally occurring Polymer- The polymers which found in nature are called naturally occurring polymers.


Ex- Starch, protein, rubber and nucleic acid.


(ii) Semisynthetic polymer- Semisynthetic polymers are obtained by chemical reaction with polymers occurring in nature. The rubber with improved properties obtained by vulcanization of natural rubber, is used in the formation of tyres.


(iii) Synthetic polymers- Synthetic polymers are man-made polymers.


Ex- Fibres, plastic and rubber.


2. Classification based on Polymerisation Reaction:


(i) Homopolymer- When two or more types of simple organic monomers of the same type combine with one another through chemical bond formation gives polymers then these polymers are called homopolymer.


Ex- Polythene is a homopolymer which is prepared of ethene.


(ii) Co-polymer- When two or more types of simple organic monomers of the different type combine with one another through chemical bond formation gives polymers then these polymers are called co-polymer.


Ex- Styrene Butadiene Rubber is a co-polymer which is prepared from styrene and butadiene.


(iii) Addition polymers- The polymers which are formed by combination of chemical bond formation of simple organic monomers having double bond are called addition polymer.


Ex- Polystyrene is an addition polymer which is prepared from styrene.


(iv) Condensed polymers- When two different types of simple monomers combine with one another by condensed polymerisation and gives polymers after removal of molecule like water, ammonia or alcohol are called condensed polymers.


Ex- Nylon6,6 is a condensed polymer which is obtained from hexamethylene diamine and adipic acid.


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