Write the monomers of the following polymers:

• (a) Bakelite
• (b) Nylon - 6,6

To understand the monomers of specific polymers like Bakelite and Nylon-6,6, it's essential to first grasp what a monomer is. Monomers are the small, repeating units that bond together to form a polymer. Each polymer has its unique structure and properties, which are determined by the types of monomers used in its synthesis.

Bakelite

Bakelite is a type of thermosetting plastic that is formed from the polymerization of phenol and formaldehyde. The monomers involved in Bakelite are:

• Phenol: This aromatic compound has a hydroxyl group (-OH) attached to a benzene ring. It serves as one of the primary building blocks in Bakelite.
• Formaldehyde: A simple aldehyde, formaldehyde is crucial for cross-linking the phenol molecules, leading to the hard and durable structure characteristic of Bakelite.

During the polymerization process, phenol and formaldehyde undergo a series of reactions, including condensation, to form a three-dimensional network. This network structure is what gives Bakelite its strength and heat resistance, making it suitable for various applications, including electrical insulators and kitchenware.

Nylon-6,6

Nylon-6,6 is a type of synthetic polymer known as a polyamide. Its name indicates that it is made from two different monomers, each containing six carbon atoms. The monomers for Nylon-6,6 are:

• Hexamethylenediamine: This is a diamine with the formula H2N-(CH2)6-NH2. It contains two amine groups that will react to form the polymer.
• Adipic acid: This is a dicarboxylic acid with the formula HOOC-(CH2)4-COOH. It provides the carboxylic acid groups necessary for the polymerization process.

The polymerization of these two monomers occurs through a condensation reaction, where water is released as a byproduct. The resulting Nylon-6,6 has a strong and flexible structure, making it widely used in textiles, ropes, and various engineering applications.

Summary

In summary, the monomers for Bakelite are phenol and formaldehyde, while Nylon-6,6 is synthesized from hexamethylenediamine and adipic acid. Understanding these building blocks not only helps in grasping the chemistry behind these materials but also their applications in everyday life.