Use of temperature-modulated dsc to analyze the glass transition

摘要

Structural recovery in polymeric glass formers leads to the enthalpy overshoot in non-isothermal experiments. One common model for describing this phenomenon is the Tool-Narayanaswamy-Moynihan (TNM) equation. Here we use the TNM equation to simulate typical temperature-modulated DSC (TMDSC) data for various cooling and heating rates. We analyze the data using a fast Fourier transform to obtain the average, reversing, and non-reversing heat flows. The non-reversing heat flow is used to compute the fictive emperature of the aged glass and is compared to the value expected from the input simulated data. The errors associated with the data analysis are quantified.