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Dispersity
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==Effect of polymerization mechanism== Typical dispersities vary based on the mechanism of polymerization and can be affected by a variety of reaction conditions. In synthetic polymers, it can vary greatly due to [[reactant]] ratio, how close the [[polymerization]] went to completion, etc. For typical addition [[polymerization]], ''Δ'' can range around 5 to 20. For typical step polymerization, most probable values of ''Δ'' are around 2 —[[Carothers' equation]] limits Δ to values of 2 and below. [[Living polymerization]], a special case of addition polymerization, leads to values very close to 1. Such is the case also in biological polymers, where the dispersity can be very close or equal to 1, indicating only one length of polymer is present.
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