Q22 of 50 Page 1

Explain the difference between Buna – N, and Buna – S.

Buna-N:

The monomers are as follows:


Butadiene- CH2 = CH-CH = CHs


Acrylonitrile- CH2 = CH - CN


The reaction is as follows:



This polymer is also called as nitrile rubber and this used in the manufacture of oil seals, protective gloves etc.


Buna – S:


The monomers are as follows:


1, 3- Butadiene


Styrene


The reaction as follows:



It is also called as Styrene Butadiene Rubber and it possess less tensile strength in comparison with natural rubber and it is used in the manufacture of automobile tyres etc.


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