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Polymers
Addition (Chain Growth) Polymerisation
1 question from 1 paper, each with its answer.
- question
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- of Polymers
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Concepts tested
- Chain growth versus step growth polymers
All Questions
2004 AIPMT 1 question
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Which one of the following is a chain growth polymer :-Chain growth (addition) polymers are formed by repeated addition of monomer molecules having a double bond, through free radical, cationic or anionic chain reactions, without loss of any small molecule.
Polystyrene is made by free radical polymerisation of styrene: $n\,C_6H_5CH=CH_2 \rightarrow [-CH(C_6H_5)-CH_2-]_n$. It is a chain growth polymer.
Nucleic acids, proteins and starch are natural condensation (step growth) polymers. They are formed by joining monomers (nucleotides, amino acids and glucose) with loss of water molecules, through phosphodiester, peptide and glycosidic linkages.
So the chain growth polymer is polystyrene.