Question

Which of the following is not an example of addition polymer?

• A. Terylene
• B. Polypropylene
• C. Polythene
• D. Polytetrafluoroethene

Answer 1

The correct option is A Terylene

In this type of polymerisation, the molecules of the same monomer or diferent monomers add together on a large scale to form a polymer. The monomers used are unsaturated compounds, e.g., alkenes, alkadienes and their derivatives. This mode of polymerisation leads to an increase in chain length and chain growth can take place through the formation of either free radicals or ionic species. However, the free radical governed addition or chain growth polymerisation is the most common mode.

Ethylene glycol and terephthalic acid are monomers that on polymerization give terylene with water as a byproduct. Hence, not an addition polymer. Terylene is a condensation polymer.

Polypropylene and polythene are addition polymers and are produced via chain-growth polymerization from the monomer propylene and ethylene respectively.

Polytetrafluoroethene is a addition polymer made from the monomer known as tetrafluoroethene

Hence, option (a) is the answer.