Buna-S

Synthesis of Buna S

It is a random co-polymer formed by the emulsion polymerization of a mixture of 1:3 butadiene and styrene in the presence of peroxide catalyst at 5 degree Celsius and therefore the product is called as cold rubber. The rubber obtained is also called Styrene butadiene rubber (SBR).

In Buna-S, Bu stands for butadiene and, Na for sodium and S for styrene. It is vulcanized with sulphur. The rubber is slightly inferior to natural rubber in its physical properties.

Properties of Buna–S:

• It is very tough and a good substitute for natural rubber.
• It possesses high abrasion resistance.
• It has high load bearing capacity.

Uses of Buna–S:

• It is used for manufacturing automobile tyres.
• It is used for making floor tiles, footwear components, cable insulation etc.

Applications:

• It finds application due to its high resistance to abrasion.
• It is used for the manufacture of passenger car tyres and treads,motor cycle and scooter tyres, cycle tyres and tubes.
• They are also used for the manufacture of conveyor belts, foot-wares, shoe soles, hoses and electrical insulation.