Which of the following polymers is a thermosetting polymer that cannot be remolded or reused upon heating?
Answer and explanation
Correct answer: C. Bakelite
- Step 1: Polymers are classified by mechanical behavior upon heating into thermoplastics and thermosetting plastics.
- Step 2: Thermoplastics (polyethene, polystyrene, PVC) consist of linear or branched chains held by weak intermolecular forces that soften when heated and harden on cooling, allowing repeated remolding.
- Step 3: Thermosetting polymers like Bakelite undergo extensive irreversible covalent cross-linking upon initial heating, forming an infusible, rigid 3D network that chars rather than melts when reheated.
Answer
Bakelite.
Why not the others: Polyethene is a thermoplastic; Polystyrene is a thermoplastic; Polyvinyl chloride is a thermoplastic.
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