“…19,20 In these extended analytical models, the interphase is considered as a third phase, with a mechanical behavior different from that of the bulk polymer. 21 Several studies have shown better performance of these three-phase models with respect to the related two-phase model in the determination of the mechanical properties of nanoreinforced polymers, [22][23][24][25] but then the main modelling difficulties are focused on the representative properties of this interphase to be introduced in the model.…”