Identify Teflon: which description correctly names this widely used fluoropolymer?
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APhenol–formaldehyde resin
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BAn inorganic polymer
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CPolytetrafluoroethylene (PTFE)
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DA monomer
Answer
Correct Answer: Polytetrafluoroethylene (PTFE)
Explanation
Introduction / Context:Teflon is a well-known trade name for a fluorinated polymer famous for its low surface energy, chemical inertness, and high temperature resistance.
Given Data / Assumptions:
- Teflon corresponds to PTFE.
- PTFE is an organic polymer consisting of carbon–carbon backbone fully fluorinated.
- Applications include non-stick coatings, seals, and chemical service linings.
Concept / Approach:PTFE’s repeat unit is –CF2–CF2– obtained by addition polymerisation of tetrafluoroethylene. It is not a phenolic resin, not an inorganic polymer, and certainly not a monomer.
Step-by-Step Solution:Map Teflon → PTFE.Eliminate incorrect classes.Select PTFE.
Verification / Alternative check:Material datasheets and standards list PTFE under fluoropolymers with extremely low friction coefficients.
Why Other Options Are Wrong:Phenolic resin is a different thermoset; “inorganic polymer” does not fit carbon-based PTFE; a monomer is a single small molecule, not Teflon.
Common Pitfalls:Confusing PTFE with PFA or FEP; all are fluoropolymers but have distinct processing windows.
Final Answer:Polytetrafluoroethylene (PTFE)