Monomers of nylon 6,6 are ...............and ................

Answer

To find the monomers of nylon 6,6, we can follow these steps:

### Step 1: Understand the Composition of Nylon 6,6
Nylon 6,6 is a type of polyamide, which means it is formed from the reaction of an amine and a carboxylic acid. The "6,6" in its name indicates that both monomers used in its formation have six carbon atoms.

### Step 2: Identify the Monomers
The two monomers that combine to form nylon 6,6 are:
1. **Adipic Acid**: This is a dicarboxylic acid with the formula HOOC-(CH2)4-COOH. It has two carboxylic acid groups (-COOH).
2. **Hexamethylene Diamine**: This is a diamine with the formula H2N-(CH2)6-NH2. It has two amine groups (-NH2).

### Step 3: Write the Chemical Structures
- **Adipic Acid**: The structure can be represented as:
\[ HOOC-CH2-CH2-CH2-CH2-COOH \]

- **Hexamethylene Diamine**: The structure can be represented as:
\[ H2N-CH2-CH2-CH2-CH2-CH2-CH2-NH2 \]

### Step 4: Describe the Polymerization Process
When adipic acid and hexamethylene diamine react, they undergo a condensation reaction. During this process, a molecule of water (H2O) is eliminated, and the two monomers link together to form the polymer nylon 6,6.

### Conclusion
Thus, the monomers of nylon 6,6 are:
- **Adipic Acid**
- **Hexamethylene Diamine**