Interrelationships of limiting diffusive transport quantities

Closely connected with the conformational dimensions of the polymer coil, and therefore with the limiting viscosity number, are some other macroscopic quantities, viz. the limiting sedimentation coefficient and the limiting diffusivity. 

According to Svedberg and Pederson (1940) the sedimentation coefficient is defined as the sedimentation velocity in a unit field of force (e.g. in a centrifuge)  

For a given polymer in a given solvent the sedimentation coefficient is dependent on polymer concentration, molecular weight, temperature and pressure. 

Extrapolation of the s-value to zero concentration gives the limiting sedimentation coefficient  

This limiting sedimentation coefficient is like [77] an important polymer property. The temperature dependence may be approximated by the expression 

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