42266 2017 eng 1156 1161 10 6 article ACS Publications 1 -- -- -- The discussions on the nanoconfinement effect on the glass transition and glassy dynamics phenomena have yielded many open questions. Here, the thickness dependence of the thermal glass transition temperature of thin films of a PVME/PS blend is investigated by ellipsometry. Its thickness dependence was compared to that of the dynamic glass transition (measured by specific heat spectroscopy), and the deduced Vogel temperature (T0). While and T0 showed a monotonous increase, with decreasing the film thickness, the dynamic glass transition temperature () measured at a finite frequency showed a non-monotonous dependence that peaks at 30 nm. This was discussed by assuming different cooperativity length scales at these temperatures, which have different sensitivities to composition and thickness. This non-monotonous thickness dependence of disappears for frequencies characteristic for T0. Further analysis of the fragility parameter, showed a change in the glassy dynamics from strong to fragile, with decreasing film thickness. ACS Macro Letters 10.1021/acsmacrolett.7b00625 2161-1653 06.11.2017 Sherif Madkour Paulina Szymoniak Andreas Hertwig M. Heidari R. von Klitzing S. Napolitano M. Sferrazza Andreas Schönhals eng uncontrolled Thin polymeric films eng uncontrolled Ellipsometry eng uncontrolled Specific heat spectroscopy Analytische Chemie Ingenieurwissenschaften und zugeordnete Tätigkeiten Verlagsliteratur Datei im Netzwerk der BAM verfügbar ("Closed Access")