2019 · Q78
When hot water is placed into an empty water bottle, the bottle keeps its shape and does not soften. What type of plastic is the water bottle made from?
General KnowledgeChemistry
- AThermoplastic
- BPVC
- CPolyurethane
- DThermosetting
Explanation
Thermosetting plastics undergo irreversible cross-linking on heating and do not soften or melt when reheated, so a bottle made of such plastic keeps its shape in hot water. Thermoplastics, by contrast, soften on heating. PVC and polyurethane are specific polymers that can behave as thermoplastics. Hence option D is correct.