The two monomers for the synthesis of nylon 6,6 are : [Main...

The two monomers for the synthesis of nylon 6,6 are : [Main Jan. 12, 2019 (II)] (a) $\mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{NH}_{2}$ (b) $\mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{NH}_{2}$ (c) $\mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{NH}_{2}$ \text { (d) } \mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{NH}_{2}

The two monomers for the synthesis of nylon 6,6 are :
[Main Jan. 12, 2019 (II)]
(a) $\mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{NH}_{2}$
(b) $\mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{NH}_{2}$
(c) $\mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{NH}_{2}$
\text { (d) } \mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{6} \mathrm{COOH}, \mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{NH}_{2}

Key Concepts

Polyamides

A class of polymers characterized by repeating units joined by amide bonds. They are typically synthesized through the reaction of diamines and dicarboxylic acids. Nylon, as a notable example, benefits from the strong intermolecular forces provided by these amide linkages, which contribute to its strength and durability.

Monomer Functionality

This concept refers to the number of reactive sites present on a monomer molecule. In the context of polymer synthesis like nylon, using monomers with two reactive groups (such as a diamine and a dicarboxylic acid) is essential for creating long polymer chains via repeated reactions, ensuring the formation of a high molecular weight polymer through continuous bonding.

Condensation Polymerization

This is a type of polymerization where monomers react to form a polymer and a small byproduct, frequently water. The process involves the reaction between functional groups (such as amine and carboxylic acid groups) on the monomers, leading to the formation of bonds (like amide bonds in polyamides) that connect monomer units in the polymer chain.

Step-Growth Polymerization

A polymerization method in which bi- or multifunctional monomers react in a stepwise fashion to form larger and larger molecules, eventually leading to high molecular weight polymers. Each step involves the reaction between pairs of reactive groups, and the growth of the polymer chain can occur between any two reactive species in the mixture.

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