We want to elucidate whether the so-called ¿strong-fragile¿ transition reported for water mixtures is a universal phenomenon driven by confinement effects originated by the freezing of the slow component of the system. We propose the study of a mixture of a polymer and THF, where no H-bonds are formed, to discard solvent clusterisation and strong solvent/polymer interactions as additional ingredients to induce peculiarities in the dynamics of the fast component.