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- Question
Flexible foam (for mattresses) are usually made of
Options- A. PVC
- B. silicone rubber
- C. polyurethanes
- D. polyamides
- Correct Answer
- polyurethanes
- 1. Branched chair polymers as compared to linear polymers have
Options- A. higher melting point.
- B. higher tensile strength.
- C. lower density.
- D. none of these. Discuss
- 2. Neoprene is rendered non-inflammable, because of
Options- A. its cross-linked structure.
- B. its linear chain structure.
- C. the presence of chlorine atoms in its monomer.
- D. the absence of chlorine atoms in its monomer. Discuss
- 3. Addition polymerisation is not involved in the manufacture of
Options- A. low density polythene.
- B. poly vinyl chloride.
- C. polystyrene.
- D. polyhexamethylene adipamide. Discuss
- 4. Pick out the wrong statement.
Options- A. Linear polymers are formed from bifunctional groups only and are normally thermoplastic.
- B. Cross-linked branched chain polymers are either elastometric or thermosetting.
- C. Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point.
- D. Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction. Discuss
- 5. Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C.
Options- A. -20
- B. 50
- C. 250
- D. 500 Discuss
- 6. Addition of stabiliser during PVC manufacture is done to
Options- A. improve its impact strength.
- B. improve its elasticity.
- C. reduce the melt viscosity & glass transition temperature.
- D. prevent its thermal degradation. Discuss
- 7. __________ fibres are made of polyamides.
Options- A. Dacron
- B. Nylon
- C. Rayon
- D. Orion Discuss
- 8. Condensation polymerisation of formaldehyde with __________ does not produce phenolic resin.
Options- A. resorcinol
- B. phenol
- C. para-cresol
- D. melamine Discuss
- 9. Nylon-6 as compared to nylon-66 is
Options- A. harder.
- B. more abrasion resistant.
- C. having higher melting point.
- D. none of these. Discuss
- 10. __________ is a copolymer.
Options- A. Nylon-66
- B. Polyrophylene
- C. PVC
- D. Poly tetra flouro ethylene Discuss
Polymer Technology problems
Search Results
Correct Answer: lower density.
Correct Answer: the presence of chlorine atoms in its monomer.
Correct Answer: polyhexamethylene adipamide.
Correct Answer: Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction.
Correct Answer: 50
Correct Answer: prevent its thermal degradation.
Correct Answer: Nylon
Correct Answer: melamine
Correct Answer: none of these.
Correct Answer: Nylon-66
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