Does the Molecular Weight Dependence of Tg Correlate to Me?

The nature of the molecular weight (MW) dependence of the glass transition temperature ( T g ) in polymers still remains a subject of discussion. Recently, Hintermeyer et al. [ Macromolecules 2008, 41, 9335] proposed that the MW at which the dependence of T g saturates corresponds to the molecular weight between entanglements, M e . We demonstrate on the example of four polymers that there is no relationship between M e and saturation of the molecular weight dependence of T g .