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Polymer Technology

Polymer Technology
Which of the following polymers belong to the class of formaldehyde resin?

None of these
Melamine resins
Teflon
Dacron

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Polymer Technology
The process involved in converting rubber into a thin sheet or coating it on fabric is called

Extrusion
Vulcanisation
Calendering
Mastication

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Polymer Technology
Condensation polymerisation of formaldehyde with __________ does not produce phenolic resin.

Para-cresol
Resorcinol
Melamine
Phenol

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Polymer Technology
__________ are produced by reacting polybasic acid (e.g. phthalic anhydride) with polyhydric alcohol (e.g., glycerol).

Unsaturated polyester
Saturated polyester
Alkyd resins
Amino resins

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Polymer Technology
Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the

Electrical insulation purpose
Decorative laminates
Tanning of leather
Strengthening of plaster of paris

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

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

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