Question

Thermosetting plastics cannot be softened by heating because:

• A. they are large cross-linked molecules with strong covalent bonds b/w the atoms along each chains
• B. they are large cross-linked molecules with strong electrovalent bonds between the atom along each chain.
• C. they are cross linked polymers with hydrogen bonds b/w each other.
• D. they are linear chains of polymers

Answer 1

Answer: (C)

The correct option is A they are cross linked polymers with hydrogen bonds b/w each other.
Thermosetting polymers are formed from monomers of viscous state which changes irreversibly on heating into an infusible insoluble polymer. They have high crosslinks due to which they are rigid.