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- Question
Cross linked polymers formed from bi-and trifuctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer __________ properties.
Options- A. thermoplastic
- B. thermosetting
- C. elastometric
- D. brittleness
- Correct Answer
- elastometric
- 1. Polyvinyl chloride (PVC)
Options- A. is produced by polycondensation reaction.
- B. uses either emulsion or suspension polymerisation methods.
- C. can be made thermosetting by adding a plasticiser.
- D. softening temperature is 200°C. Discuss
- 2. Plexiglass (also called lucite) because of its high optical transparency is used for making lenses. It is chemically
Options- A. polymethyl methacrylate (PMMA).
- B. Polytetraflouroethylene(PTFE).
- C. polycarbonates.
- D. phenolic resins. Discuss
- 3. Polycaprolactum is
Options- A. nylon-6
- B. nylon-66
- C. dacron
- D. rayon Discuss
- 4. Thermosetting plastic materials
Options- A. can be repeatedly melted.
- B. is useful for melt casting.
- C. can not be melted after forming.
- D. is useful for spinning. Discuss
- 5. Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their
Options- A. molecular sizes.
- B. magnitude of intermolecular forces.
- C. resistance to heat.
- D. polymerisation mechanism. Discuss
- 6. Silicone is a/an
Options- A. monomer
- B. inorganic polymer
- C. thermoplastic material
- D. a natural polymer Discuss
- 7. Nylon-6 is a
Options- A. polyamide
- B. thermosetting resin
- C. polyester
- D. none of these Discuss
- 8. A chain growth polymerisation reaction consists of three different types of reaction namely initiation reaction, propagation reaction & termination reaction. Chain growth polymerisation reaction is not involved in the manufacture of
Options- A. siloxane elastomers.
- B. polyamides.
- C. vinyl polymers.
- D. urea-formaldehyde resins. Discuss
- 9. Thermosetting materials
Options- A. are cross-linked molecules.
- B. soften on application of heat.
- C. are solvent soluble.
- D. none of these. Discuss
- 10. Phenol formaldehyde
Options- A. employs addition polymerisation.
- B. employs condensation polymerisation.
- C. is a monomer.
- D. is an abrasive material. Discuss
Polymer Technology problems
Search Results
Correct Answer: uses either emulsion or suspension polymerisation methods.
Correct Answer: polymethyl methacrylate (PMMA).
Correct Answer: nylon-6
Correct Answer: can not be melted after forming.
Correct Answer: magnitude of intermolecular forces.
Correct Answer: inorganic polymer
Correct Answer: polyamide
Correct Answer: urea-formaldehyde resins.
Correct Answer: are cross-linked molecules.
Correct Answer: employs condensation polymerisation.
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