Which is not the biodegradable polymer?

Options

A. Nylon-2-Nylon-6
B. Poly (Glycolic acid) and Poly (Lactic acid)
C. Glyptal
D. PHBV

Answer

To determine which polymer is not biodegradable among the given options, we will analyze each polymer mentioned in the question.

### Step-by-Step Solution:

1. **Identify the Polymers**: The question provides four polymers. We need to analyze each one to see if it is biodegradable or not. The polymers mentioned are:
- Nylon 2-6
- Polyglycolic acid
- Polylactic acid
- Glyptal

2. **Analyze Nylon 2-6**:
- Nylon 2-6 is formed from caproic acid and glycine.
- It undergoes hydrolytic degradation, breaking down into carbon monoxide and water.
- Since it can break down into simpler substances, Nylon 2-6 is considered a biodegradable polymer.

3. **Analyze Polyglycolic Acid**:
- Polyglycolic acid is known for its hydrolytic degradation.
- It breaks down into glycolic acid, which is a monomer.
- Therefore, polyglycolic acid is also a biodegradable polymer.

4. **Analyze Polylactic Acid**:
- Polylactic acid also undergoes hydrolytic degradation.
- It breaks down into lactic acid, which is another monomer.
- Thus, polylactic acid is also a biodegradable polymer.

5. **Analyze Glyptal**:
- Glyptal is derived from phthalic acid and glycerol.
- Unlike the previous polymers, glyptal does not readily undergo biodegradation.
- It is resistant to microbial attack and does not break down into simpler substances easily.
- Therefore, glyptal is classified as a non-biodegradable polymer.

### Conclusion:
Based on the analysis, the polymer that is not biodegradable is **Glyptal**.