Discussion
Consider the following statements about polymer molecular weight.
1. A polymer sample contains chains of many different lengths.
2. The weight average exceeds the number average for such a sample.
3. The two averages are equal for any real polymer.
Answer: B
The first two are correct, and their ratio is the polydispersity index. The third holds only for a hypothetical monodisperse sample, which real polymerisation never produces. A narrower distribution generally processes better.
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