Question

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

• A. Sulphur
• B. Strength
• C. Styrene
• D. Sulphonation

Hint:

Buna-N is a similar copolymer where 'N' stands for {Acrylonitrile}. Both are types of synthetic rubber.

Answer 1

The Correct Option is C

The question asks us to identify what the 'S' stands for in the polymer "Buna-S". To solve this, let's briefly discuss the composition and naming of the polymer:

• Buna-N: Often used for nitrile rubber that involves "Acrylonitrile".
• Buna-S: This is a type of synthetic rubber, specifically a copolymer, formed by the polymerization of butadiene and styrene.

Therefore, in the name "Buna-S":

• 'Bu': represents butadiene.
• 'Na': originally comes from sodium, used in the polymerization process.
• 'S': stands for styrene, which is a key component of Buna-S rubber. Styrene is a monomer derived from benzene and is used to enhance the strength and durability of the polymer.

Now, let's evaluate the options given:

• Sulphur: Sulphur is often used in the vulcanization process of rubber but is not related to the name 'Buna-S'.
• Strength: Although styrene increases the strength of the polymer, 'Strength' is not directly related to the name.
• Styrene: Correct, as explained above, this is the correct answer.
• Sulphonation: A chemical process, but not related to the name.

Therefore, the correct answer is Styrene.