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Chemical Engineering - Polymer Technology

Exercise : Polymer Technology - Section 2
21.
Flexible foam (for mattresses) are usually made of
PVC
silicone rubber
polyurethanes
polyamides
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
__________ fibres are made of polyamides.
Dacron
Nylon
Rayon
Orion
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Pick out the wrong statement.
Linear polymers are formed from bifunctional groups only and are normally thermoplastic.
Cross-linked branched chain polymers are either elastometric or thermosetting.
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.
Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C.
-20
50
250
500
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Which of the following is stretched into fibres ?
Saturated polyester
Unsaturated polyester
Isoprene
Bakelite
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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