Question

Which of the following polymers is not correctly matched?

• A. Formation of dacron - Step-growth polymerisation
• B. Formation of polytetrafluoroethene - Step-growth polymerization
• C. Formation of polythene - Chain-growth polymerization in presence of benzoyl peroxide
• D. Formation of polyacrylonitrile - Chain-growth polymerization in presence of peroxide

Answer 1

The correct option is B Formation of polytetrafluoroethene - Step-growth polymerization

[1] Chain-growth polymerisation- This forms addition polymers. This mode of polymerisation leading to an increasein chain length or chain growth can take place through the formation of either free radicals or ionic species. However, the free radical governed addition is the most common mode.

[2] Step-growth polymerisation- This forms condensation polymers.In these reactions, the product of each step is again a bi-functional species and the sequence of condensation goes on. Since each step produces a distinct functionalised species and is independent of each other, this process is called as step growth polymerisation.

Since polytetrafluoroethylene is an addition polymer, it is formed by chain growth polymerisation.
Option B is not correctly matched.