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Polymer Technology

Polymer Technology
Density of high density polythene is about __________ gm/c.c.

0.99
1.18
0.95
1.05

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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.

Sulphuric acid
Organic peroxides
None of these
Hydroflouric acid

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Polymer Technology
The monomer of natural rubber is

Isoprene
2 methyl-1-propene
Both B and C
DMT

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Polymer Technology
Size range of polymer molecules varies from __________ metre.

10⁻⁸ to 10⁻¹⁰
10⁻⁴ to 10⁻⁷
10⁻¹ to 10⁻²
10⁻² to 10⁻⁵

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Polymer Technology
Neoprene which is used for making shoe heels & belts is superior to natural rubber in its stability to aerial oxidation and resistance to oils & other solvents. The monomer used for making neoprene is

None of these
Chloroethane
Isoprene
Chlorophrene

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Polymer Technology
Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser?

Tricresyl phosphate
Stearic acid estors
Ethylene glycol
Esters of phthalic acid

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