Question

The monomers of Buna-S rubber are-
(A) Isoprene and butadiene
(B) Butadiene and phenol
(C) Styrene and butadiene
(D) Vinyl chloride and sulphur

Answer 1

Hint: The natural rubber market was captured by several synthetic rubbers. We can now use custom elastomers for any specific purpose in a few days. One of the most common synthetic rubber is Buna-S rubber.

Complete step by step solution:
> This product is a random copolymer formed in the presence of peroxide catalyst at 5 ° C, by emulsion polymerization of a mixture of 1:3 butadiene and styrene, and is thus called cold rubber. The obtained rubber is also referred to as styrene butadiene rubber. BU is the butadiene in Buna-S, Na the styrene the sodium and S. It is sulphur-vulcanized. In its physical properties, the rubber is slightly lower than natural rubber.
Due to its high abrasion resistance, it finds application. It is used to produce tires and treads for passenger cars, engine cycles and scooters, cycle pipes and tubing. They also produce conveyor belts, foot-wares, shoe sols, pants and electric insulation.
Styrene and butadiene are the monomers of Buna-S rubber.
- Ethyl benzene is Styrene ${C_6}{H_5} - CH = C{H_2}$.
- Butadiene is $C{H_2} = CH - CH = C{H_2}$.
Buna S is also known as butadiene rubber styrene. Used to produce internal pipes for pneumatics, engines, bubble gums, etc.
Option C is therefore correct.

Note: Buna-S rubber also serves as an alternative to PVA for construction applications, as a screening and binding agent backwards, but is more expensive. It offers better resistance, reduced retraction and increased flexibility, as well as emulsification resistance in humid conditions, in the latter application. SBR is frequently applied as part of cement-based waterproofing (basement) systems where it is mixed with water as a liquid and is used as the Gauging solution for mixing powdered Tanking to slurry. SBR supports bond strength, reduces shrinkage potential, and adds a flexibility element.