Polydispersity

From Freepedia

The polydispersity index, or PDI, is the ratio of the weight average molecular weight to the number average molecular weight. It indicates the distribution of individual molecular weights in a batch of polymers. In biological polymers, it can be very close or equal to 1, indicating only one length of polymer is present. In synthetic polymers, it can vary greatly due to reactant ratio, how close the polymerization went to completion, etc.

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