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Polymer Technology
Comments
Question
Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6.
Options
A. -20 to 25
B. 50 to 75
C. 100 to 150
D. 250-280
Correct Answer
250-280
Polymer Technology problems
Search Results
1. Unbreakable crockeries are made from __________ polymers.
Options
A. polystyrene
B. melamine
C. polystyrene
D. polyurathane
Show Answer
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Discuss
Correct Answer: melamine
2. Bakelite is
Options
A. same as polytetra flouro ethylene (PTFE).
B. an inorganic polymer.
C. same as thermoset phenol formaldehyde.
D. not a polymer.
Show Answer
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Correct Answer: same as thermoset phenol formaldehyde.
3. Synthetic rubber
Options
A. deforms, if stretched to double of its original dimension.
B. is brittle at low temperature
C. is softer at higher temperature.
D. is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases.
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Correct Answer: is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases.
4. Vulcanisation of rubber does not increase its
Options
A. elasticity
B. plasticity
C. ductility
D. none of these
Show Answer
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Discuss
Correct Answer: plasticity
5. Properties of a polymer is affected by the
Options
A. chain length.
B. intermolecular forces.
C. branching & cross-linking.
D. all (a), (b).
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Correct Answer: all (a), (b).
6. In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer?
Options
A. PTFE
B. Buna-S
C. PMMA
D. Polycaprolactum
Show Answer
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Correct Answer: Buna-S
7. Silicone resins, which are highly water repellant and has good heat resistance can not be used
Options
A. as room temperature adhesive.
B. as grease & lubricant.
C. hydraulic fluid for heat transfer.
D. resin for lamination.
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Correct Answer: as room temperature adhesive.
8. Nylon-66 compared to nylon-6 has
Options
A. lower melting point.
B. more abrasion resistant properties.
C. higher hardness.
D. all (a), (b) and (c).
Show Answer
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Correct Answer: higher hardness.
9. Which of the following is not the commercial name of polymethylmethacrylate (PMMA)?
Options
A. Perspex
B. Lucite
C. Plexiglass
D. Teflon
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Correct Answer: Teflon
10. Which of the following is a copolymer?
Options
A. Polystyrene
B. SBR
C. P.T.F.E.
D. Polypropylene
Show Answer
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Correct Answer: SBR
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