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How many of the following are condensation polymers? Teflon, Nylon 66, PVC, Buna-S, Bakelite, Terylene, Neoprene, Silicones, HDPE.

1. 2
2. 3
3. 4
4. 5

Correct answer: 4

Solution

Condensation polymers among the list: Nylon 66 (amide bonds, eliminates water), Bakelite (phenol-formaldehyde, eliminates water), Terylene/PET (ester bonds, eliminates water), Silicones (Si-O-Si backbone, eliminates water). That is 4. The rest — Teflon, PVC, Buna-S, Neoprene, HDPE — are addition polymers formed by opening of double (or C-F) bonds without loss of a small molecule.

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