MCQ
Which polymer among the following polymers does $\text{NOT}$ soften on heating?
- ✓Bakelite
- BPolythene
- CPolystyrene
- D$\text{PVC}$
✓
Answer
Correct option: A.
Bakelite
Thermoplastics:
A plastic material, which can be repeatedly melted$-$molded again and again by simple heating, is called a thermoplastic. Thermoplastics become soft and moldable on heating. They can then be recast in different shapes and cooled. On cooling the thermoplastic material hardens.
Polyethylene, polystyrene and $\text{PVC}$ are examples.
Thermosetting plastics:
A plastic material, which cannot be repeatedly melted$-$molded again, is called a thermosetting plastic.thermosetting plastics do not become soft on heating and they do not change their shape on heating.
Bakelite is one example of a thermosetting plastic.
A plastic material, which can be repeatedly melted$-$molded again and again by simple heating, is called a thermoplastic. Thermoplastics become soft and moldable on heating. They can then be recast in different shapes and cooled. On cooling the thermoplastic material hardens.
Polyethylene, polystyrene and $\text{PVC}$ are examples.
Thermosetting plastics:
A plastic material, which cannot be repeatedly melted$-$molded again, is called a thermosetting plastic.thermosetting plastics do not become soft on heating and they do not change their shape on heating.
Bakelite is one example of a thermosetting plastic.
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