Question

Which from following polymers does NOT contain either -COO- or -CO-NH- linkage in it?

• A. Perspex
• B. Polyacrylamide
• C. Glyptal
• D. Thermocol

Hint:

Condensation polymers (like Glyptal, Dacron, Nylon) are built specifically by creating ester ($-\text{COO}-$) or amide ($-\text{CONH}-$) bridges between monomers. Addition polymers (like Teflon, PVC, Polystyrene) usually just snap their $\text{C=C}$ double bonds into long, unbroken carbon chains!

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Polymers can be classified by their functional linkages. Polyesters contain $-COO-$ (ester) and Polyamides contain $-CO-NH-$ (amide).

Step 2: Formula Application:
1. Perspex: Polymethyl methacrylate (Ester linkage). 2. Polyacrylamide: Contains amide groups. 3. Glyptal: A polyester made from phthalic acid and glycerol (Ester linkage).

Step 3: Explanation:
Thermocol is a trade name for expanded Polystyrene. Polystyrene is an addition polymer of styrene ($C_6H_5CH=CH_2$). It consists purely of a hydrocarbon chain with phenyl substituents and contains no ester or amide linkages.

Step 4: Final Answer:
Thermocol does not contain ester or amide linkages.