Discussion
Consider the following statements about step growth polymerisation.
1. High molecular weight is reached only at very high conversion.
2. Monomer disappears early while the chains are still short.
3. The molecular weight rises steeply from the first few per cent of reaction.
Answer: D
The first two are correct and are the characteristic signature of step growth. The third describes chain growth polymerisation, where full length chains form from the outset. The two mechanisms behave quite differently with conversion.
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