ᴇxᴘʟᴀɪɴ ᴛʜᴇ ᴅɪғғᴇʀᴇɴᴄᴇ ʙᴇᴛᴡᴇᴇɴ ʙᴜɴᴀ-ɴ ᴀɴᴅ ʙᴜɴᴀ-s.
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It is obtained by polymerization of 1,3-Butadiene & styrene in the ratio 3:1 in the presence of sodium. In Buna –S, Bu stands for butadiene,na for sodium & S for styrene.It is also called SBR(Styrene Butadiene Rubber). It has slightly less tensile strength than natural rubber.
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