Discussion
Match the following additives to their respective functions for poly(vinyl chloride) compounding.
| Additive | Function | ||
|---|---|---|---|
| P. | Dibutyltin maleate | 1. | Lubricant |
| Q. | Epoxydized soybean oil | 2. | Extender |
| R. | Chlorinated paraffin wax | 3. | Heat stabilizer |
| S. | Calcium stearate | 4. | Plasticizer |
Answer: A
The correct matching is P-3; Q-4; R-2; S-1.
- Dibutyltin maleate is an organotin heat stabilizer, which stops PVC losing HCl during processing (P-3).
- Epoxidized soybean oil is a plasticizer (it also helps stabilize) (Q-4).
- Chlorinated paraffin wax is a cheap secondary plasticizer, an extender used to replace part of the primary plasticizer (R-2).
- Calcium stearate is a lubricant that eases flow and release from the metal surfaces (S-1).
The other options assign the tin compound as an extender or plasticizer, or the stearate as a heat stabilizer or plasticizer, which do not match the main functions of these additives.
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