Polymer Technology
Styrene butadiene rubber (SBR) as compared to natural rubber has

Poorer resistance
Greater amount of heat build up heavy loading
Poor tensile strength
All of these

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Polymer Technology
Synthetic rubber

Is softer at higher temperature
Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases
Is brittle at low temperature
Deforms, if stretched to double of its original dimension

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Polymer Technology
Identify the group in which all the polymers mentioned can be used to make fibres.

Polypropylene, Poly vinyl chloride, Silicon
Cellulose derivatives, Polyisoprene, Polyethylene
Butadiene copolymers, Polyamides, Urea aldehyde
Cellulose derivatives, Polyamides, Polyurathane

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