Thermosoftening & Thermosetting Polymers Quiz
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5 questions, one answer each
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1. What happens when a thermosoftening polymer is heated?
- A. It chars and decomposes
- B. It melts and can be reshaped
- C. It forms new covalent cross-links
- D. It turns into a monomer
2. Why do thermosetting polymers not melt when heated?
- A. They have no polymer chains
- B. They have covalent cross-links holding the chains together
- C. They contain only weak intermolecular forces
- D. They are not made from monomers
3. What type of force is overcome when a thermosoftening polymer melts?
- A. Covalent bonds within each chain
- B. Ionic bonds between ions
- C. Weak intermolecular forces between separate chains
- D. Metallic bonds between delocalised electrons
4. Which statement correctly distinguishes thermosoftening from thermosetting polymers?
- A. Thermosoftening polymers have cross-links; thermosetting polymers do not
- B. Thermosoftening polymers can be remelted repeatedly; thermosetting polymers cannot melt due to cross-links
- C. Thermosetting polymers are always weaker than thermosoftening polymers
- D. Thermosoftening polymers cannot be shaped at all
5. A manufacturer needs a plastic that keeps its shape permanently even when exposed to high heat, such as a saucepan handle. Which type of polymer is most suitable, and why?
- A. Thermosoftening, because it melts easily for shaping
- B. Thermosetting, because covalent cross-links prevent it from melting
- C. Thermosoftening, because it has strong cross-links
- D. Thermosetting, because it has only weak intermolecular forces