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The process in which monomercomes together and forms the long-chain ( branched or linear long-chain) is known as polymerization.

The monomer used in polymerization are:

• Macromolecules 鈥淗uge-molecule鈥�
• High molecular density molecule
• High molecular weight molecules

The monomer is used to form the polymer with the help of certain kinds of initiators (In). Upon decomposition, the unstable compound gives the radical or cation that will initiate the reaction further.

2-phenyl-1,3-butadiene monomer on polymerization form the polymer is the 1,2-addition process in which the monomer has four carbon chains with an alternative double bond. The polymer formed has a double bond where there was a single bond in the monomer and a single bond where there was a double bond in the monomer.

The polymer formed by monomer 2-phenyl-1,3-butadiene is shown as follows:

Formation of polymer