Discussion
Match the polymers with their characteristic infrared (IR) stretching frequency
| Polymer | IR stretch (cm-1) |
|---|---|
| P. Polyurethane | 1. ~2234 |
| Q. Polyethylene | 2. ~1151 |
| R. Polysulfone | 3. ~1720 |
| S. Acrylonitrile-butadiene-styrene copolymer | 4. ~2914 |
Answer: B
The match is P-3; Q-4; R-2; S-1.
- Polyurethane: the urethane C=O stretch, about 1720 cm-1.
- Polyethylene: the CH2 C-H stretch, about 2914 cm-1.
- Polysulfone: the symmetric O=S=O stretch, about 1150 cm-1.
- ABS: the nitrile C≡N stretch from acrylonitrile, about 2234 cm-1.
The options giving polyethylene the 1720 or 1151 band, or the sulfone the 2234 band, mismatch the groups: polyethylene has only C-H and C-C bonds, and only ABS has a nitrile.
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