Classification of Polymer..

Branched polymers: They consist of chain structure having one main chain of molecules with smaller chains as branches of main chain. For example, polypropylene, glycogen, etc.

Linear polymers: They are made up of long and straight chains, i.e. continuous chains without any excess attachments, i.e. branches. For example, polythene, PVC, etc.

Cross-linked (Network) polymers :

They are usually formed from bifunctional or trifunctional monomers and they contain strong covalent bonds between various linear polymer chains. This leads to network like structure. They are so called due to cross-linking. For example, bakelite, melamine, etc.