Which of the following polymer is NOT a thermoplastic ?

Detailed Solution:

The correct answer is “Neoprene”.

Neoprene is not a thermoplastic. Neoprene, on the other hand, is a synthetic rubber.

Neoprene is a type of thermosetting polymer, not a thermoplastic. Unlike thermoplastics, which can be melted and re-molded multiple times, thermosetting polymers like neoprene solidify irreversibly once set and cannot be remelted.

Teflon, Polystyrene, and Polythene are all thermoplastics, which means they can be heated and re-molded repeatedly.