Stockmayer Casassa relation

In the dilute concentration region, the virial equation is usually truncated after the second virial coefficient which leads to a hnear relationship. A hnearized relation over a wider concentration range can be constructed if the Stockmayer-Casassa relation between 2 and 3 is applied ... 

A2,A3,. .. second, third,... osmotic virial coefficients The molar mass of the polymer, M2, is the number-average, M , if polydisperse samples are investigated. Corresponding averages of the virial coefficients can be introduced, too. In the dilute concentration region, the virial equation is usually truncated after the second virial coefficient which leads to a linear relationship. A linearized relation over a wider concentration range can be constructed. Equation [4.4.38], if the Stockmayer-Casassa relation, Equation [4.4.37], between A2 and A3 is applied ... 

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