Chemical Engineering - Polymer Technology

11.
Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ?
Ammonium alum
Potassium alum
both a & b
neither a nor b
Answer: Option
Explanation:
No answer description is available. Let's discuss.

12.
Automobile steering wheels are normally made of
cellulose acetate
cellulose nitrate
PVC
high density polythene
Answer: Option
Explanation:
No answer description is available. Let's discuss.

13.
In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer ?
Bakelite (phenol formaldehyde)
Polyester
Polythene
Nylon-6
Answer: Option
Explanation:
No answer description is available. Let's discuss.

14.
90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.
-5
10-30
250-280
500-600
Answer: Option
Explanation:
No answer description is available. Let's discuss.

15.
Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent.
1-1000
1000-1500
1500-2000
2000-2500
Answer: Option
Explanation:
No answer description is available. Let's discuss.