Polymers

A Polymer is a long chain of molecules or macromolecules that are built by joining repeating chemical units. Each molecule of a polymer can consist of hundreds, thousands or even millions of repeating units.
The number of units in a polymer chain plays an important role in determining its properties. Polyethylene, for example, is derived from the basic unit of ethylene gas. As the number of units in the chain increases, the product changes from a gas to a liquid and then to a brittle or waxy solid. As the number increases, the polymer chains become long enough that they can begin to entangle with each other and lead to the properties more often associated with polymers.

(1) Classification according to monomer:
Homopolymer: Only one monomer (A) is used to form the polymer.
Copolymer: Two monomers (A and B) are used in the polymerization reaction.
Alternating copolymer (alternating copolymer): monomer alternating copolymer.
Random copolymer: random combination of monomers.
Block copolymer: monomers are attached in blocks.

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