In polymer Buna- S : ' S ' stands for:

Step-by-step solution

Buna-- S , ' S ' stand for styrene. Buna – S is a more commonly used name for a polymer named styrene butadiene rubber. The structure of Buna – S is given by: Buna – S is formed using the monomers butadiene and styrene. Thus in Buna – S, the Bu stands for Butadiene, since butadiene is one of the constituent monomers of the given polymer. Also, Na stands for sodium and S represents the monomer Styrene used for the synthesis of the given polymer.