Chemical Engineering - Polymer Technology

21. 

Thermosplastic materials

A. do not soften on application of heat.
B. are heavily branched molecules.
C. are solvent insoluble.
D. none of these.

Answer: Option D

Explanation:

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22. 

Polyvinyl acetate is never used for making

A. moulded articles
B. fibres
C. adhesives
D. all (a), (b) & (c)

Answer: Option A

Explanation:

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23. 

Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is

A. 7 kgf/cm2 and 70 °C.
B. 1000 kgf/cm2 and 100°C.
C. 7 kgf/cm2 and 700°C.
D. 1 kgf/cm2 (gage) and 70°C.

Answer: Option A

Explanation:

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24. 

Vulcanisation of rubber does not increase its

A. elasticity
B. plasticity
C. ductility
D. none of these

Answer: Option B

Explanation:

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25. 

In nylon-6, the number 6 represents the total number of

A. carbon atoms in the ring.
B. carbon atoms in the linear polymer chain.
C. nitrogen atoms in the ring.
D. hydrogen atoms in the ring.

Answer: Option B

Explanation:

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