ABSTRACT
This paper deals with problems that are encountered in modern GPC with dual detection (refractometer-viscometer) when calculating average molecular weights, that can lead to incorrect values. Three main problems are developed: axial dispersion in columns, dependence of elution volumes upon solute concentration, and application of the hydrodynamic volume concept. In each case, we have tried to empha size the best method that takes into account these different effects, avoiding data treatment errors and that leads, thus, to the best accuracy in the determination of average molecular weights of polymers.
