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Polymer Technology

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

-20
250
500
50

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Polymer Technology
Vulcanisation of rubber does not increase its

Softness
Oxidation resistance
Weight & strength
Elasticity & water solubility

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Polymer Technology
Main constituent of natural rubber is

Polybutadiene
Polyisoprene
Poly chloroprene
Polystyrene

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Polymer Technology
Poly Vinyl chloride (PVC) is a __________ material.

Fibrous
Thermoplastic
Chemically active
Thermosetting

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Polymer Technology
Softening point of high density polythene is about __________ °C.

135
165
205
85

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Polymer Technology
In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of

Polyesters
Phenol formaldehyde resins
Cross linked polystyrene
Polyamides

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