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Polymer Technology

Polymer Technology
Transistor parts and refrigerator components are normally made of

High density polythene
Polyester
Polyurathane
Polystyrene

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

250-280
100 to 150
50 to 75
-20 to 25

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Polymer Technology
Low pressure Zeigler process of polythene manufacture

Employs a pressure of 30 kgf/cm²
Achieves an yield of 95-98% based on ethylene
Produces very low density polythene
Does not use any catalyst for polymerisation

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Polymer Technology
Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent.

1000-1500
1-1000
2000-2500
1500-2000

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Polymer Technology
The conversion of caprolactum in the above case is about __________ percent.

25
90
50
70

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Polymer Technology
Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals.

Hydroflouric acid
Sulphuric acid
None of these
Organic peroxides

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