Definition of Polymer
A polymer is a chemical compound that is formed as a result of bonding of a large number of molecules in a repeating manner. They may be homopolymers or heteropolymers. The homopolymers are made up of the same repeating units (monomers).
An example of homopolymer is polyvinylchloride (PVC). PVC has vinyl chloride in a long, repeating chain. Another example of homopolymer is polypropylene which has a large number of propylene molecules bonded together. ASTM International has agreed upon this that a homopolymer would be composed of 99% by weight a single monomer and it would have 1% or less by weight another monomer.