On the basis of monomer units:
Polymers can be classified into two types:
1. Homopolymers:
A polymer formed from only one kind of repeating units or monomers is called homopolymer.
Example: Polythene and PVC.
2. Copolymers:
A polymer formed from more than one kind of monomer units is called copolymer or mixed polymer. For example, Buna – S rubber which formed from 1, 3 – butadiene and styrene are examples of the copolymer.
