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How many of the following are thermoplastic polymers? Polyethylene, Teflon, PVC, Nylon, Bakelite, Melamine-formaldehyde resin, PMMA, Polystyrene, Vulcanized rubber, Urea-formaldehyde resin.

1. 4
2. 5
3. 6
4. 7

Correct answer: 6

Solution

Thermoplastics: Polyethylene (yes), Teflon (yes), PVC (yes), Nylon (yes), PMMA (yes), Polystyrene (yes) — 6 total. Thermosets/cross-linked: Bakelite (phenol-formaldehyde, thermoset), Melamine-formaldehyde resin (thermoset), Vulcanized rubber (cross-linked by sulfur bridges, thermoset), Urea-formaldehyde resin (thermoset) — 4 total. Total thermoplastics = 6.

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