Which of the following polymer is a polyamide?

Options

A. Terylene
B. Nylon
C. Rubber
D. Vulcanised rubber

Explanation

To determine which of the following polymers is a polyamide, we need to understand what a polyamide is. A polyamide is a polymer that contains a large number of amide linkages, which are characterized by the functional group -C(=O)-N-.

Let's analyze the options provided:

1. **Terylene**:
- Terylene is made from the monomers terephthalic acid and ethylene glycol.
- The structure of Terylene does not contain any amide linkages; instead, it contains ester linkages.
- Therefore, Terylene is a polyester, not a polyamide.

2. **Nylon 6-6**:
- The monomers of Nylon 6-6 are hexamethylenediamine and adipic acid.
- The reaction between these monomers involves the formation of amide linkages (C(=O)-N) through a condensation reaction, where water is eliminated.
- Since Nylon 6-6 contains a large number of amide linkages, it is classified as a polyamide.

3. **Natural Rubber**:
- Natural rubber is primarily composed of polyisoprene, which does not contain any amide linkages.
- Therefore, natural rubber is not a polyamide.

4. **Vulcanized Rubber**:
- Vulcanized rubber is formed from natural rubber through a process that creates disulfide linkages between polymer chains.
- It also does not contain amide linkages, thus it is not a polyamide.

Based on this analysis, the only polymer that qualifies as a polyamide is **Nylon 6-6**.

### Final Answer:
**Nylon 6-6 is a polyamide.**