What is the repeating structural monomer unit in the commercial synthetic addition polymer Teflon (polytetrafluoroethylene, PTFE)?
Answer and explanation
Correct answer: A. Tetrafluoroethylene (CF2=CF2)
- Step 1: Teflon is synthesized by free-radical addition polymerization of tetrafluoroethylene: n CF2=CF2 -> -[CF2-CF2]-_n. Step 2. Strong C-F bonds give PTFE exceptional chemical inertness, high thermal stability, and low friction coefficient. Answer: Tetrafluoroethylene (CF2=CF2). Why not the others: Vinyl chloride forms PVC; CFCl3 is a chlorofluorocarbon refrigerant.
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