Chapter 14 Extra Questions

Chapter 14 Extra Questions - c Recyclability Thermosetting...

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Extra Questions 1. Make comparisons of thermoplastic and thermosetting polymers on the basis of a) Mechanical characteristics upon cooling and heating- Thermoplastic polymers soften when heated and harden when cooled, whereas thermosetting polymers, harden upon heating, while further heating will not lead to softening. b) Possible molecular structures- Thermoplastic polymers have linear and branched structures, while for thermosetting polymers, the structures will normally be network or crosslinked.
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Unformatted text preview: c) Recyclability- Thermosetting becomes permanently hard during formation, while with heat and pressure thermoplastics can be changed easily. 2. Define isomerism and give one example Isomerism is when two or more polymer molecules or repeat units have the same composition, but different atomic arrangements. Ex: Hydrocarbons with the same composition but different arrangements. 3. Can polystyrene be isotactic? Why or why not? Yes, because it is linear....
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