what is polymerization

Polymerization is a process in which monomer molecules react chemically to form polymer chains or three-dimensional networks. There are many forms of polymerization, including chain-growth polymerization, which involves the linking together of unsaturated monomers containing carbon-carbon double bonds. Polymerization can be conducted using various methods, including emulsion polymerization, solution polymerization, suspension polymerization, and precipitation polymerization. Two classes of polymerization are usually distinguished: condensation polymerization and addition polymerization. In condensation polymerization, each step of the process is accompanied by the formation of a molecule of some simple compound, often water. In addition polymerization, monomers react to form a polymer without the formation of by-products. Polymerization is used to create polymers, which are then processed to make various kinds of plastic products.