Nylon-66 is a polyamide synthesized from __________________?
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Answer: A. Hexamethylene diamine and adipic acid
Explanation
The synthesis of nylon-66 involves equimolar amounts of hexamethylene diamine and adipic acid reacting to form a polyamide. Step-growth condensation links the diamine and dicarboxylic acid monomers by eliminating water molecules. The correct option accurately specifies hexamethylene diamine and adipic acid as the precursors for nylon-66. Hexamethylene diamine is an organic diamine containing six carbon atoms in a straight aliphatic chain. Adipic acid is a dicarboxylic acid also containing a six-carbon aliphatic backbone chain structure. The resulting polymer repeat unit alternates between diamine and acid segments linked by stable amide bonds.
Textile manufacturing plants produce large quantities of nylon-66 fibers for industrial fabrics and apparel. Automotive engineering utilizes molded nylon-66 for high-strength parts subjected to mechanical stress and heat. Controlling monomer purity and reaction stoichiometry is critical to achieving high molecular weights in nylon production. Option B suggests methyl amine, which is a monofunctional amine that would terminate polymer chain growth instantly. Option C lists vinyl chloride and formaldehyde, which are precursors used to manufacture completely different plastics. Option D is incorrect because the correct precursor chemicals are explicitly named in the first choice.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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