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

    Multiple Choice QuestionsLong Answer Type

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    171. 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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