Which of the followingis an additional polymer?

Options

A. Nylon-`6,6`
B. Dacron
C. High-density polythene
D. Nylon-`6,6`

Answer

To determine which of the following is an additional polymer, we need to understand the definition and characteristics of addition polymers. Addition polymers are formed through the addition of monomers without the loss of any small molecules, such as water or alcohol.

### Step-by-Step Solution:

1. **Understand the Definition of Addition Polymer**:
- An addition polymer is formed when monomers join together without the elimination of any by-products.

2. **Analyze the Given Options**:
- **Nylon 66**: This is formed from hexamethylene diamine and adipic acid with the elimination of water. Therefore, it is a condensation polymer.
- **Dacron**: This is made from ethylene glycol and terephthalic acid, also with the elimination of water. Hence, it is also a condensation polymer.
- **Caprolactam**: This is used to produce nylon, which involves the removal of a small molecule, indicating it is not an addition polymer.
- **High-Density Polyethylene (HDPE)**: This is produced from the polymerization of ethylene (CH2=CH2) without any by-products being released.

3. **Identify the Additional Polymer**:
- Among the options, **High-Density Polyethylene (HDPE)** is the only one formed through addition polymerization, as it involves the direct addition of ethylene monomers without the loss of any small molecules.

4. **Conclusion**:
- The answer to the question "Which of the following is an additional polymer?" is **High-Density Polyethylene (HDPE)**.