Question

Identify thermoplastic polymer from following.

• A. Polyvinyl
• B. Bakelite
• C. Terylene
• D. Neoprene

Hint:

Thermoplastics = "Plastic" behavior (melt and reuse). Thermosets = "Set" like concrete (once done, it's permanent).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Polymers are broadly classified based on their intermolecular forces and thermal behavior into four categories: elastomers, fibers, thermoplastics, and thermosetting polymers. Thermoplastics are linear or slightly branched long-chain molecules capable of repeatedly softening on heating and hardening on cooling without chemical change.
Step 2: Key Formula or Approach:
Approach: Classify the given polymers based on their thermal properties and structural cross-linking to identify the one that melts upon heating.
Step 3: Detailed Explanation:
Let's examine the classification of each option: - (A) Polyvinyl: Examples include Polyvinyl Chloride (PVC) and polyvinyl acetate. These are predominantly linear polymers with intermolecular forces intermediate between elastomers and fibers. They soften upon heating and can be easily remolded, classifying them strictly as thermoplastics. - (B) Bakelite: It is a phenol-formaldehyde resin. It undergoes extensive 3D cross-linking upon heating in molds to become an infusible, hard, rigid mass. It cannot be remelted or reshaped, making it a thermosetting polymer. - (C) Terylene: Also known as Dacron, it is a polyester. It possesses strong intermolecular forces like hydrogen bonding or dipole-dipole interactions, giving it high tensile strength. It is classified primarily as a fiber. - (D) Neoprene: It is a synthetic rubber. Its polymer chains are held together by the weakest intermolecular forces, allowing it to be easily stretched and return to its original shape. It is classified as an elastomer.
Step 4: Final Answer:
Polyvinyl is the thermoplastic polymer.