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Define polymerization?


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Polymerization:

  • Polymerization is defined as the chemical process in which the monomers are joined together to form polymers.
  • Normally, it takes several thousands of monomers to make a single polymer.

There are two types of polymerization:

(a) Addition polymerisation:

  • When the monomers are added together with the help of a catalyst it is known as addition polymerization.
  • The formation of addition polymers occurs by the repeated addition of monomer molecules that possess triple or double bonds.
  • For example, the formation of ((C3H6)n) polypropene from (C3H6) propene, and ((C2H4)n) polythene from (C2H4) ethene.

(b) Condensation polymerization:

  • When the monomers are added together with the byproduct and require two different types of monomers that join alternately, it is known as condensation polymerization.
  • The formation of condensation polymers occurs by the repeated condensation reaction between two different tri-functional or bi-functional monomeric units.
  • In this type of reaction, small molecules such as alcohol, water, hydrogen chloride, etc. are eliminated.
  • Few examples, are nylon 6, nylon 6, 6, terylene (dacron), etc.

The formation of nylon 6, 6 occurs due to the condensation of hexamethylene diamine (C6H16N2) with adipic acid (C6H10O4).


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