Discussion
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- Question
Thermosetting materials
Options- A. are cross-linked molecules.
- B. soften on application of heat.
- C. are solvent soluble.
- D. none of these.
- Correct Answer
- are cross-linked molecules.
- 1. 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
- 2. Nylon-6 is a
Options- A. polyamide
- B. thermosetting resin
- C. polyester
- D. none of these Discuss
- 3. Silicone is a/an
Options- A. monomer
- B. inorganic polymer
- C. thermoplastic material
- D. a natural polymer Discuss
- 4. 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 Discuss
- 5. 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
- 6. Phenol formaldehyde
Options- A. employs addition polymerisation.
- B. employs condensation polymerisation.
- C. is a monomer.
- D. is an abrasive material. Discuss
- 7. Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature.
Options- A. nylon
- B. polyacrylonitrile
- C. polypropylene
- D. polyester Discuss
- 8. Which of the following is the lowest cost plastic commercially available?
Options- A. Polythene
- B. Teflon
- C. Bakelite
- D. PVC Discuss
- 9. Polymerisation of poly functional monomers produces polymers having
Options- A. good machanical strength
- B. low viscosity
- C. low melting point
- D. none of these Discuss
- 10. Branched chain polymers compared to linear polymers have higher
Options- A. density.
- B. tensile strength.
- C. melting point.
- D. degree of irregularity in atomic packing. Discuss
Polymer Technology problems
Search Results
Correct Answer: urea-formaldehyde resins.
Correct Answer: polyamide
Correct Answer: inorganic polymer
Correct Answer: elastometric
Correct Answer: uses either emulsion or suspension polymerisation methods.
Correct Answer: employs condensation polymerisation.
Correct Answer: polyacrylonitrile
Correct Answer: Polythene
Correct Answer: good machanical strength
Correct Answer: degree of irregularity in atomic packing.
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