Explain structure of polyacrylonitrile.
Polyacrylonitrile (PAN) is a synthetic polymer with the repeating unit:
[-CH2-CH(CN)-]n
In this structure, the "-CH2-" represents the ethylene (C2H4) unit, "-CH(CN)-" represents the acrylonitrile (CH2=CH-CN) unit, and "n" indicates the repetition of these units to form the polymer chain.
Polymerization is a chemical reaction in which a large number of monomer molecules combine to produce a polymer. A polymerization can yield macromolecules with a linear or branching structure. They can also take the form of a three-dimensional complicated network.
Polymerization reactions are divided into two groups, namely, Addition polymerization (chain reaction) and condensation reaction (step reaction).