There are three different types based on the structure of the polymers.

(i) Linear polymer: These polymers consist of long and straight chains. Such as polythene, polyvinyl chloride etc.

(ii) Branched chain polymers: These polymers contain linear chains having some branches. Such as low density polythene.

(ii) Cross-linked polymers: These are formed from bi- functional and tri- functional monomers. Such as bakelite, malamin etc.