Which of the following polymer has ester linkage?

Options

A. Nylon-6,6
B. PVC
C. Terylene
D. SBR

Explanation

To determine which of the given polymers has an ester linkage, we need to analyze the structure of each polymer and identify the presence of the ester functional group (–COO–).

### Step-by-Step Solution:

1. **Identify the Ester Linkage**:
An ester linkage is characterized by the presence of the –COO– group. This can be formed through the reaction of a carboxylic acid and an alcohol, resulting in the elimination of water.

2. **Examine Nylon 6-6**:
- **Monomers**: Hexamethylenediamine and adipic acid.
- **Structure**: The polymerization involves the formation of amide linkages (–NHCO–) between the amine and carboxylic acid groups.
- **Conclusion**: Nylon 6-6 does not contain ester linkages; it contains amide linkages.

3. **Examine PVC (Polyvinyl Chloride)**:
- **Monomer**: Vinyl chloride (CH2=CHCl).
- **Structure**: The polymer is formed through addition polymerization, where the double bond opens up to link monomers together.
- **Conclusion**: PVC does not contain ester linkages.

4. **Examine Terylene**:
- **Monomers**: Ethylene glycol and terephthalic acid.
- **Structure**: The polymerization involves the condensation of the hydroxyl groups of ethylene glycol with the carboxylic acid groups of terephthalic acid, resulting in the formation of ester linkages (–COO–).
- **Conclusion**: Terylene does contain ester linkages and is classified as a polyester.

5. **Examine SBR (Styrene-Butadiene Rubber)**:
- **Monomers**: Styrene and butadiene.
- **Structure**: The polymer is formed through addition polymerization, which does not involve the formation of ester linkages.
- **Conclusion**: SBR does not contain ester linkages.

6. **Final Conclusion**:
Among the polymers analyzed, **Terylene** is the only polymer that has ester linkages.

### Answer:
The polymer that has ester linkage is **Terylene**.