TY - JOUR A1 - Yin, Huajie A1 - Schönhals, Andreas T1 - Calorimetric glass transition of ultrathin poly(bisphenol A carbonate) films JF - Soft matter N2 - Specific heat spectroscopy in the frequency range from 1 Hz to 10³ Hz with a sensitivity of pJ K-1 was employed to study the glass transition behavior of ultrathin poly(bisphenol A carbonate) (PBAC) films with thicknesses ranging from 192 nm down to 10 nm. The amplitude and the phase angle of the complex differential voltage as a measure of the complex heat capacity were obtained as a function of temperature at a given frequency simultaneously. Both spectra are used to determine the dynamic glass transition temperature as a function of both the frequency and the film thickness. As the main result no thickness dependence of the dynamic glass transition temperature was observed down to a film thickness of 10 nm within the experimental uncertainty of ±3 K. The obtained data were compared with literature results in detail. PY - 2012 DO - https://doi.org/10.1039/c2sm26174j SN - 1744-683X VL - 8 IS - 35 SP - 9132 EP - 9139 PB - RSC Publ. CY - Cambridge AN - OPUS4-26379 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -