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UPSEE Solved Model Paper 5

Question : 95 of 150

Marks: +1, -0

Which type of polymer is the buna-S rubber?

Solution:

A copolymer is defined as a polymer formed when two (or more) different types of monomers and are linked in the same polymer chain.

Buna - s is a copolymere of butadiene and styrene.

The reaction is

\underset{\text{Butadiene}}{n\mathrm{CH}_2\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_2}

\underset{\text{styrene}}{x\mathrm{C}_6\mathrm{H}_5 - \mathrm{CH}=\mathrm{CH}_2}

→

(-

\mathrm{CH}_2-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_2

)-

\,{}_n

(-

\mathrm{CH}_2-\overset{\mathrm{C}_6\mathrm{H}_5}{\overset{\vert}{\mathrm{CH}}}

)-

_x

Styrene - butadiene rubber

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