Recycling thermoplastics is possible but recycling thermosetting plastics is not, because thermosetting plastics
Correct answer: C. cannot be melted and reshaped once their cross links have formed
- A. are always coloured
- B. are made from natural materials
- C. cannot be melted and reshaped once their cross links have formed
- D. dissolve in water
Explanation
The permanent covalent network of a thermoset means heating it decomposes the material rather than softening it, so it can only be ground into filler or burnt for energy recovery. A thermoplastic has independent chains held by weak forces, so it can be melted and re-formed many times. This is why sorting plastic waste by type is the first step in any recycling scheme.
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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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