Chemical Engineering - Polymer Technology

1. 

Polypropylene compared to polythene is

A. harder
B. stronger
C. lighter
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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2. 

The rate controlling step in the manufacture of silicone rubber is the

A. polymer termination step.
B. condensation of siloxane to silicone.
C. initial hydrolysis of silicone monomer.
D. none of these.

Answer: Option C

Explanation:

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3. 

Buna-S is also called

A. polyurathane
B. SBR
C. teflon
D. bakelite

Answer: Option B

Explanation:

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4. 

Diphenylamine is added to rubber to

A. valcanise it.
B. protect it from deterioration on exposure to air.
C. make it non-inflammable.
D. make it thermosetting.

Answer: Option B

Explanation:

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5. 

Vulcanisation of raw rubber makes it

A. soft
B. less elastic
C. plastic
D. tacky

Answer: Option B

Explanation:

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