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Polymer Technology

Polymer Technology
Buna-N is also called

Neoprene
Thiokol
Nitrile rubber
Butyl rubber

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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
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?

Ethylene glycol
Esters of phthalic acid
Stearic acid estors
Tricresyl phosphate

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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
The process involved in converting rubber into a thin sheet or coating it on fabric is called

Calendering
Mastication
Extrusion
Vulcanisation

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Polymer Technology
__________ tubes are good substitude for human blood vessels onrheart by-pass operation.

Polystyrene
Polythene
PVC
Teflon/dacron

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