Question:
Buna–N is a polymer of:
Buna–N is a polymer of:
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Buna–N rubber is also known as nitrile rubber and is widely used in oil seals, gaskets, and fuel hoses due to its chemical resistance.
Updated On: May 19, 2025
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The Correct Option is B
Approach Solution - 1
Buna–N is a synthetic rubber and is a copolymer formed from 1,3-butadiene (CH$_2$=CH–CH=CH$_2$) and acrylonitrile (CH$_2$=CH–CN). The presence of the nitrile group provides resistance to oil and chemicals, making Buna–N a suitable material for use in automotive and industrial applications.
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Approach Solution -2
Buna–N is a polymer of:
Step 1: Introduction to Buna–N:
Buna–N, also known as Nitrile Butadiene Rubber (NBR), is a widely used synthetic rubber. It is particularly valued for its excellent resistance to oils, chemicals, and fuels, which makes it useful in automotive and industrial applications such as fuel hoses, gaskets, and seals.
Step 2: Understanding its monomers:
Buna–N is formed through a copolymerization reaction, which means it is made by combining two different monomers:
- One of the monomers is butadiene, a conjugated diene with the structure CH₂=CH–CH=CH₂. It provides flexibility and elasticity to the final polymer.
- The second monomer is acrylonitrile, which has the structure CH₂=CH–CN. This monomer introduces polarity into the polymer, improving its resistance to oils and solvents.
Step 3: Polymerization process:
These two monomers undergo a free radical polymerization process. The resulting copolymer consists of repeating units derived from both butadiene and acrylonitrile. The exact properties of Buna–N can be tuned by varying the ratio of acrylonitrile to butadiene — higher acrylonitrile content improves oil resistance, while higher butadiene content enhances flexibility.
Step 4: Identification from image:
From the given image:
- The first structure is butadiene (CH₂=CH–CH=CH₂)
- The second structure is acrylonitrile (CH₂=CH–CN)
These are the correct monomers used to prepare Buna–N.
Final Answer:
\[ \boxed{\text{Butadiene and Acrylonitrile}} \]
Step 1: Introduction to Buna–N:
Buna–N, also known as Nitrile Butadiene Rubber (NBR), is a widely used synthetic rubber. It is particularly valued for its excellent resistance to oils, chemicals, and fuels, which makes it useful in automotive and industrial applications such as fuel hoses, gaskets, and seals.
Step 2: Understanding its monomers:
Buna–N is formed through a copolymerization reaction, which means it is made by combining two different monomers:
- One of the monomers is butadiene, a conjugated diene with the structure CH₂=CH–CH=CH₂. It provides flexibility and elasticity to the final polymer.
- The second monomer is acrylonitrile, which has the structure CH₂=CH–CN. This monomer introduces polarity into the polymer, improving its resistance to oils and solvents.
Step 3: Polymerization process:
These two monomers undergo a free radical polymerization process. The resulting copolymer consists of repeating units derived from both butadiene and acrylonitrile. The exact properties of Buna–N can be tuned by varying the ratio of acrylonitrile to butadiene — higher acrylonitrile content improves oil resistance, while higher butadiene content enhances flexibility.
Step 4: Identification from image:
From the given image:
- The first structure is butadiene (CH₂=CH–CH=CH₂)
- The second structure is acrylonitrile (CH₂=CH–CN)
These are the correct monomers used to prepare Buna–N.
Final Answer:
\[ \boxed{\text{Butadiene and Acrylonitrile}} \]
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