Polymer Technology - Chemical Engineering Questions and Answers

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__________ moulding is used for shaping of thermosetting plastics exclusively.

Compression

Injection

Transfer

Extrusion

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Bristles of tooth brushes are made of

nylon-6

nylon-66

polystyrene

PVC

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Pick out the wrong statement.

Cold SBR is superior as compared to hot SBR.

Polymerisation temperature can modify the properties of SBR.

Production of cold SBR employs lower pressure as compared to that of hot SBR.

None of these.

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Starting material for the production of butadiene in India is

naphthalene

benzol

ethyl alcohol

phthalic anhydride

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Liners of bags are usually made of

polythene

PVC

polypropylene

polyesters

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Poly Vinyl chloride (PVC) is a __________ material.

thermoplastic

thermosetting

fibrous

chemically active

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Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butediene rubber) are

50°C and 3 - 4 kg/cm²

50°C and 1 kgf/cm²

250°C and 10 kgf/cm²

250°C and 1 kgf/cm²

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Polystyrene is a __________ plastic at room temperature.

ductile

brittle

malleable

none of these

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Amino resins are used in paper treatment to improve its

wet tear and bursting strength.

folding endurance

wet rub resistance

all (a), (b) & (c)