Question:
What are the compounds used to obtain nylon salt?
What are the compounds used to obtain nylon salt?
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Nylon-6,6 gets its name because both of its starting monomers (Adipic acid and Hexamethylenediamine) contain exactly 6 carbon atoms each!
Updated On: Jun 19, 2026
- Adipic acid and ammonia
- Terephthalic acid and hexamethylenediamine
- Adipic acid and hexamethylenediamine
- $\beta$-hydroxybutyric acid and hexamethylenediamine
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
The question asks for the specific pair of chemical monomers that react together to form an intermediate known as "nylon salt," which is then polymerized to make nylon.
Step 2: Detailed Explanation:
Nylon-6,6 is a classic synthetic polyamide. It is manufactured via a step-growth condensation polymerization.
The two specific starting monomers are:
1. A 6-carbon dicarboxylic acid: Adipic acid ($\text{HOOC-(CH}_2)_4\text{-COOH}$)
2. A 6-carbon diamine: Hexamethylenediamine ($\text{H}_2\text{N-(CH}_2)_6\text{-NH}_2$)
When these two compounds are mixed together in an aqueous solution, an acid-base neutralization reaction occurs instantly. The acidic carboxyl groups donate protons ($\text{H}^+$) to the basic amine groups.
This forms a stable, solid ionic intermediate called hexamethylenediammonium adipate, which is widely referred to simply as Nylon salt.
When this nylon salt is subsequently heated to a high temperature under pressure, it loses water molecules (dehydration condensation) to form the strong amide linkages characteristic of the Nylon-6,6 polymer chain.
Let's evaluate the distractors:
- Terephthalic acid + Ethylene glycol forms Terylene (Dacron), a polyester.
- $\beta$-hydroxybutyric acid + $\beta$-hydroxyvaleric acid forms PHBV (a biodegradable polymer).
Step 3: Final Answer:
The compounds are Adipic acid and hexamethylenediamine, matching option (c).
The question asks for the specific pair of chemical monomers that react together to form an intermediate known as "nylon salt," which is then polymerized to make nylon.
Step 2: Detailed Explanation:
Nylon-6,6 is a classic synthetic polyamide. It is manufactured via a step-growth condensation polymerization.
The two specific starting monomers are:
1. A 6-carbon dicarboxylic acid: Adipic acid ($\text{HOOC-(CH}_2)_4\text{-COOH}$)
2. A 6-carbon diamine: Hexamethylenediamine ($\text{H}_2\text{N-(CH}_2)_6\text{-NH}_2$)
When these two compounds are mixed together in an aqueous solution, an acid-base neutralization reaction occurs instantly. The acidic carboxyl groups donate protons ($\text{H}^+$) to the basic amine groups.
This forms a stable, solid ionic intermediate called hexamethylenediammonium adipate, which is widely referred to simply as Nylon salt.
When this nylon salt is subsequently heated to a high temperature under pressure, it loses water molecules (dehydration condensation) to form the strong amide linkages characteristic of the Nylon-6,6 polymer chain.
Let's evaluate the distractors:
- Terephthalic acid + Ethylene glycol forms Terylene (Dacron), a polyester.
- $\beta$-hydroxybutyric acid + $\beta$-hydroxyvaleric acid forms PHBV (a biodegradable polymer).
Step 3: Final Answer:
The compounds are Adipic acid and hexamethylenediamine, matching option (c).
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