Discussion
Match the following:
| P. Flame retardant | 1. 4-Methyl-2,6-di-t-butyl phenol |
| Q. UV absorber | 2. Azocarbonamide |
| R. Blowing agent | 3. Phenyl salisylate |
| S. Antioxidant | 4. Aluminium trihydrate |
Answer: B
The match is P-4; Q-3; R-2; S-1.
- Aluminium trihydrate is a flame retardant: on heating it decomposes endothermically and releases water vapour, cooling the polymer and diluting flammable gases.
- Phenyl salicylate (salol) absorbs ultraviolet light and is used as a UV absorber.
- Azodicarbonamide decomposes on heating to nitrogen and other gases, so it is a chemical blowing agent for foams.
- 4-Methyl-2,6-di-t-butyl phenol is butylated hydroxytoluene (BHT), a hindered phenol antioxidant.
The other options assign BHT or azodicarbonamide to roles they do not play.
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