Question

Which one of the following is an example of thermosetting polymers?
A. Neoprene
B. Buna-N
C. Nylon- 6,6
D. Bakelite

Answer 1

For this problem, we have to study the thermosetting polymer in brief so that we can choose the correct polymer. As the polymer which consists of a cross link or has heavy branching will be the correct answer.

Complete step by step answer:
- In the given question, we have to explain the correct explanation of the thermosetting polymer among the given options.
- Now, as we know that the thermosetting polymer is those polymers which consist of heavy branching and cross-links in the structure.
- Now, among the given options Bakelite is formed by the polymerisation of two monomers that is phenol and formaldehyde.
- The structure of the Bakelite is shown below:

- When this Bakelite is heated further then it forms the heavily branched structure which consists of cross-links due to which it forms a 3D structure and also becomes hard.
- As we know that the thermosetting polymers cannot regain their structure and become hard on heating that's why Bakelite is a thermosetting polymer.
- Whereas the other polymer that is neoprene and Buna - N and Nylon - 6, 6 are considered as the thermoplastic polymer because on heating them they become off due to which they can easily change their shape.
So, the correct answer is “Option D”.

Note: The thermoplastic polymer is commonly formed by the addition reaction and also it is soluble in the organic solvents whereas the thermosetting polymer is formed by the condensation reaction & it is insoluble in the organic solvents.