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Broadband dielectric spectroscopy and differential scanning calorimetry measurements have been performed to study the molecular dynamics poly ͑vinyl pyrrolidone͒ and its water solutions in a wide range of concentrations ͑0 wt % Ͻ w c Ͻ 55 wt % ͒ and in the temperature range from 140 to 500 K. The dry material was completely characterized showing the presence of two relaxations in the supercooled state. The slow one has the characteristics of a Johari-Goldstein-type relaxation. On the otherdoi:10.1063/1.2822332 pmid:18247994 fatcat:txnznousczfuvgr2c2ml663ica