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प्रश्न
Explain the classification of polymers on the basis of structures.
उत्तर
Depending upon how the monomers are linked together, that is, the chain configuration, polymers are classified into three types:
- 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. - Branched chain polymers: Monomers having 3 functional groups or already having side chains give rise to branched chain polymers.
e.g. Low-density polythene. - 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.
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