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प्रश्न
Which of the following polymers have vinylic monomer units?
(i) Acrilan
(ii) Polystyrene
(iii) Nylon
(iv) Teflon
उत्तर
(i) Acrilan
(ii) Polystyrene
(iv) Teflon
Explanation:
The addition polymerisation of acrylonitrile in presence of a peroxide catalyst leads to the formation of polyacrylonitrile. polyacrylonitrile is used as a substitute for wool in making commercial fibres as orion or acrilan.
\[\begin{array}{cc}
\phantom{....................................}\ce{CH}\\
\phantom{..................................}|\\
\ce{\underset{Acrylonitrile}{nCH2 = CHCN} ->[Polymerisation][Peroxide catalyst] -[\underset{Polyacrylonitrile}{CH2 - CH}]\underset{n}{-}}
\end{array}\]
Polystyrene has the monomer unit styrene. Teflon is manufactured by heating tetrafluoroethylene with a free radical or persulphate catalyst at high pressures.
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