Which of the following statements regarding polymers and their daily life or industrial applications are correct?
- Teflon (polytetrafluoroethylene) is used as a non-stick coating on cookware due to its high thermal stability and chemical inertness.Answer
- Bakelite is a thermosetting plastic used to make electrical switches and utensil handles because it is a poor conductor of electricity and heat.Answer
- CPolyvinyl chloride (PVC) is a thermosetting polymer that permanent hardens and cannot be remolded upon heating.
- Vulcanization of natural rubber involves heating raw rubber with elemental sulfur to improve its elasticity and tensile strength.Answer
Answer
The correct statements are those describing Teflon as a non-stick coating, Bakelite as a thermosetting plastic for electrical switches, and vulcanization of natural rubber using sulfur.
Teflon is resistant to heat and chemicals, making it ideal for non-stick cookware coatings. Bakelite is a thermosetting polymer used in heat-resistant handles and electrical appliances. Vulcanization cross-links rubber molecules with sulfur to make it stronger and more elastic. In contrast, PVC is a thermoplastic that can be repeatedly softened and reshaped upon heating.
Step-by-Step Solution
Key Concept
Classification and industrial applications of synthetic polymers and modified natural rubber