Which polymer is used to make drinking bottles and is widely recycled?
Correct answer: B. Polyethylene terephthalate
- A. Bakelite
- B. Polyethylene terephthalate
- C. Urea formaldehyde resin
- D. Melamine resin
Explanation
Polyethylene terephthalate is a thermoplastic polyester that is clear, tough and impermeable to carbon dioxide, and because it melts without decomposing it can be recycled into fibre or new bottles. The other three are thermosetting resins used for electrical fittings, adhesives and tableware and cannot be remelted. Recycling codes on packaging identify the polymer for exactly this reason.
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About Polymers
Polymers are large molecules made from repeating monomer units joined by covalent bonds. The topic distinguishes addition polymers such as polyethylene, PVC and polystyrene from condensation polymers such as nylon and polyester, and relates chain structure to thermoplastics, thermosetting polymers, elastomers, properties, uses and environmental concerns.
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