Chemical Engineering - Polymer Technology

46. 

Which of the following is generally not drawn into fibre ?

A. Polyamide
B. Unsaturated polyesters
C. Saturated polyesters
D. Polyacrylonitrile

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

47. 

Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6.

A. -20 to 25
B. 50 to 75
C. 100 to 150
D. 250-280

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

48. 

Which of the following is not a natural polymer ?

A. Nucleic acids e.g. RNA and DNA
B. Polysaccharides
C. Polyisoprene
D. Polyurethane

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

49. 

In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.

A. viscose rayon
B. acrylic
C. polyvinyl acetate
D. saturated polyester

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

50. 

Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.

A. acrylic
B. polyester
C. nylon 6:6
D. polypropylene

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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