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Polymer Technology

Polymer Technology
Vulcanisation of raw rubber makes it

Less elastic
Plastic
Tacky
Soft

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Polymer Technology
Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness?

Phosphorous
Pine oil
Carbon black
Rosin

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Polymer Technology
__________ moulding is used for shaping of thermosetting plastics exclusively.

Compression
Extrusion
Transfer
Injection

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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
Hydroflouric acid
None of these
Organic peroxides

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Polymer Technology
Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C.

500
-20
250
50

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Polymer Technology
Thermosetting resins/polymers as compared to thermoplastic ones are

Easily reshaped & reused
More brittle
Formed by addition polymerisation only
Soluble in all organic solvents

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