Which of the following polymers does not soften on heating and harden on cooling?

Polythene

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Polyvinyls

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Polystyrene

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Urea-formaldehyde resins

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Solution

The correct option is D Urea-formaldehyde resins
Polythene, Polyvinyls and Polystyrene are Thermoplastic polymers.

Urea-formaldehyde resin is a thermosetting polymer.

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Similar questions

Which of the following are characteristics of thermosetting polymers?

(a) Heavily branched cross linked polymers

(b) Linear slightly branched long chain molecules

(d) Soften on heating and harden on cooling, can be reused

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