Fig. 2.
Effect of heating rate on the glass transition onset for H-LDA (A–C) and D-LDA (D–F) as measured by dielectric spectroscopy. The dielectric onset temperature, Tonset, shifts to lower values as the heating rate decreases. (G) The difference between the onset temperatures corresponding to D-LDA and H-LDA, ΔTonset, is plotted as a function of the heating rate. The DSC data are from ref. 14 (★) and ref. 13 (☆). The line is a linear fit to the dielectric results demonstrating that ΔTonset decreases with increasing heating rate and extrapolates to ∼1–2 K at rates corresponding to those of the DSC measurements.