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Polymer Technology

Polymer Technology
__________ polythene is most prone to stress-cracking

High density
Cross-linked
Linear low density
Low density

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Polymer Technology
Tyres are made by

Rotational moulding
Extrusion
Compression moulding
Injection moulding

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Polymer Technology
Viscosity of a polymer solution or melt

Decreases with increase in temperature
Decreases with increase in molecular weight
Increases with increase in temperature
Does not vary with temperature rise

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

50°C and 3 - 4 kg/cm²
250°C and 1 kgf/cm²
250°C and 10 kgf/cm²
50°C and 1 kgf/cm²

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Polymer Technology
Polyurathane can not be used for making

Coating material
Bottles
Mattresses & foam
Adhesives

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Polymer Technology
Rayon is superior to cotton in making gauge for wound treatment, because rayon

Can absorb over 90% of its own weight of water
Both B & C
Does not stick to the wound unlike cotton
Is a synthetic polymer

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