Polymers

Long Answer Type

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How are the following prepared?
(a) Dacron    (b) Bakelite.

(a) Dacron is obtained by heating terephthalic acid with ethylene glycol at 425–475 K. It is a condensation polymer.




(b) Bakelite is a condensation polymer. It is obtained by treating phenol with formaldehyde in the presence of an acidic or basic catalyst.



The condensation of o-hydroxy benzyl alcohol or p–hydroxy benzyl alcohol gives a linear polymer called ‘Novolac’.



On further heating with formaldehyde ‘novolac’, undergoes cross-linking to form an infusible solid called bakelite.
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    Short Answer Type

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    Short Answer Type

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