Which of the following is an addition polymer?

Options

A. Nylon 6
B. Nylon 6, 6
C. Buna-S
D. Dacron

Answer

To determine which of the given options is an addition polymer, we need to analyze each option based on the definition of addition polymers. Addition polymers are formed by the direct addition of monomeric units without the elimination of any small molecules, such as water.

### Step-by-Step Solution:

1. **Identify the Options:**
The options provided are:
- A) Nylon 6
- B) Nylon 6-6
- C) Buna-S
- D) Dacron

2. **Analyze Nylon 6:**
- Nylon 6 is produced from caprolactam through a process that involves the breaking of an amide linkage and the removal of a water molecule.
- Since water is eliminated during the formation, Nylon 6 is a condensation polymer.

3. **Analyze Nylon 6-6:**
- Nylon 6-6 is synthesized from hexamethylene diamine and adipic acid.
- Similar to Nylon 6, the process involves the removal of water molecules, classifying it as a condensation polymer.

4. **Analyze Buna-S:**
- Buna-S is formed from the copolymerization of styrene and 1,3-butadiene.
- This process involves the direct addition of the monomers without the elimination of any small molecules, which qualifies it as an addition polymer.

5. **Analyze Dacron:**
- Dacron is produced from ethylene glycol and terephthalic acid.
- The formation of Dacron also involves the removal of water molecules, making it a condensation polymer.

6. **Conclusion:**
Based on the analysis, the only addition polymer among the options is **C) Buna-S**.

### Final Answer:
**C) Buna-S is the addition polymer.**