Question

Explain the classification of polymers on the basis of structures.

Answer 1

Depending upon how the monomers are linked together, that is, the chain configuration, polymers are classified into three types:

1. Linear or straight chain polymers: When the monomer molecules are joined together in a linear arrangement the resulting polymer is a straight chain polymer. It is obtained from bifunctional monomers or alkenes.
   e.g. PVC, high-density polythene.
2. Branched chain polymers: Monomers having 3 functional groups or already having side chains give rise to branched chain polymers.
   e.g. Low-density polythene.
3. Three dimensional cross-linked polymers: Third type of arrangement is said to be cross-linked or network polymers where cross-links are produced between linear chains. Cross-linking results from polyfunctional monomers.
   e.g. Bakelite, melamine.