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RRB Group-D Model Paper 17 with answers for online practice
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© examsnet.com
Question : 66
Total: 100
Which of the following polymer is thermosetting polymer?
Terylene
Polystyrene
Bakelite
Neoprene
Validate
Solution:
The thermosetting polymer is a polymer that can be irreversibly hardened to the desired shape.
It is hardened by the process of curing of a soft solid or viscous liquid prepolymer or resin.
Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst.
Once hardened, a thermoset cannot be melted for reshaping.
Some examples of a thermosetting polymer are Polyurethanes, Polyurea, Bakelite, Urea-formaldehyde, etc.
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