Which of the following polymers are thermoplastic?

A. Teflon

B. Natural rubber

C. Neoprene

D. Polystyrene

Now Thermoplastics are polymer plastics which turn soft on heating and become hard on cooling. Natural rubber on undergoing vulcanization is said to be a thermosetting polymer. Vulcanization is basically a chemical process where the physical properties of rubber are improved. Neoprene is a thermoset or thermosetting material not a thermoplastic material. Being in the category of thermoplastic, Teflon is used for non- stick cookware and Polystyrene finds its use in CD cases and domestic appliances.