Which one of the following is an elastomer?
Show Hint
- Polyamide 6,6
- Poly(ethylene terephthalate)
- Vulcanized polybutadiene
- High density polyethylene
The Correct Option is C
Solution and Explanation
Step 1: Analyze the options.
(A) Polyamide 6,6: Polyamide 6,6, also known as nylon 6,6, is a type of thermoplastic, not an elastomer. It is used in textiles and engineering plastics, but it does not exhibit the elastic properties characteristic of elastomers.
(B) Poly(ethylene terephthalate): Poly(ethylene terephthalate) (PET) is commonly used in fibers and containers. PET is a rigid plastic and does not show the elasticity needed for an elastomer.
(C) Vulcanized polybutadiene: Vulcanized polybutadiene is a well-known elastomer. The vulcanization process enhances the elasticity of the material, making it ideal for use in tires and various rubber products.
(D) High density polyethylene: High density polyethylene (HDPE) is a thermoplastic polymer, known for its strength and rigidity. It does not possess the elasticity required to be classified as an elastomer.
Step 2: Conclusion.
The correct answer is (C) Vulcanized polybutadiene, which is an elastomer due to its excellent elastic properties.
Final Answer: (C) Vulcanized polybutadiene
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Equal and opposite forces of a constant magnitude \( F \) are applied at the two ends of a thin elastomeric rod, which is held at a temperature \( T_1 \) (where \( T_g < T_1 < T_m \), and \( T_g \) and \( T_m \) are the glass transition temperature and melting temperature respectively). If the temperature is increased to \( T_2 \) (where \( T_g < T_2 < T_m \) and \( T_2 > T_1 \)), the rod will \(\underline{\hspace{2cm}}\).
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