Question:
Identify the polymer obtained from 1,3-butadiene and acrylonitrile.
Identify the polymer obtained from 1,3-butadiene and acrylonitrile.
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Polymer Tip: Remember the names by their components: Buna-S uses Styrene, while Buna-N uses acryloNitrile.
Updated On: Apr 23, 2026
- Polyacrylamide
- Buna N
- Glyptal
- Perspex
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The Correct Option is B
Solution and Explanation
Concept:
Chemistry (Polymers) - Addition Polymers and Copolymers.
Step 1: Identify the reacting monomers. The given monomers are 1,3-butadiene ($CH_2=CH-CH=CH_2$) and acrylonitrile ($CH_2=CH-CN$).
Step 2: Determine the type of polymerization. Since both monomers contain double bonds, they undergo an addition polymerization reaction. Because there are two different monomers involved, it is specifically a copolymerization.
Step 3: Analyze the reaction mechanism. The reaction typically proceeds via a free-radical mechanism in the presence of a peroxide catalyst. The double bonds in 1,3-butadiene open up to form a continuous carbon chain, shifting a double bond to the central carbons, while the double bond in acrylonitrile also opens to link with the butadiene units.
Step 4: Formulate the polymer structure. The repeating unit formed by linking 1,3-butadiene and acrylonitrile is $-[-CH_2-CH=CH-CH_2-CH_2-CH(CN)-]_n-$.
Step 5: Identify the common name of the polymer. The synthetic rubber formed from Butadiene and acryloNitrile is commercially known as Buna-N (or Nitrile rubber). Here, 'Bu' stands for butadiene, 'na' for the sodium catalyst originally used in similar reactions, and 'N' for acrylonitrile. $$ \therefore \text{The polymer obtained is Buna N.} $$
Step 1: Identify the reacting monomers. The given monomers are 1,3-butadiene ($CH_2=CH-CH=CH_2$) and acrylonitrile ($CH_2=CH-CN$).
Step 2: Determine the type of polymerization. Since both monomers contain double bonds, they undergo an addition polymerization reaction. Because there are two different monomers involved, it is specifically a copolymerization.
Step 3: Analyze the reaction mechanism. The reaction typically proceeds via a free-radical mechanism in the presence of a peroxide catalyst. The double bonds in 1,3-butadiene open up to form a continuous carbon chain, shifting a double bond to the central carbons, while the double bond in acrylonitrile also opens to link with the butadiene units.
Step 4: Formulate the polymer structure. The repeating unit formed by linking 1,3-butadiene and acrylonitrile is $-[-CH_2-CH=CH-CH_2-CH_2-CH(CN)-]_n-$.
Step 5: Identify the common name of the polymer. The synthetic rubber formed from Butadiene and acryloNitrile is commercially known as Buna-N (or Nitrile rubber). Here, 'Bu' stands for butadiene, 'na' for the sodium catalyst originally used in similar reactions, and 'N' for acrylonitrile. $$ \therefore \text{The polymer obtained is Buna N.} $$
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