Vapor pressure by DSC: extending ASTM E 1782 below 5 kPa

The effect of volatiles on the measurement of the reaction heat by differential scanning calorimetry

“…With this method the boiling point can be determined from the peak onset with good accuracy (similar to ours [10]). …”

“…The evolution of the evaporation peaks shown in Figs.6 and 7 with the cover condition has already been reported in the literature [10,11,12] and led to propose the Standard Test Method for Determining Vapor Pressure by Thermal Analysis (ASTM E 1782-03) that entails the use of sealed crucibles with a small pinhole. With this method the boiling point can be determined from the peak onset with good accuracy (similar to ours [10]).…”

Experimental determination of the (vapor + liquid) equilibrium data of binary mixtures of fatty acids by differential scanning calorimetry

“…It was observed by other authors [5][6][7]9,16] that the hole size influences the form of the thermograms and the quality of the obtained results. The authors of this work have conducted several experiments for different hole sizes and have seen that it can be achieved a better reproducibility of the measured temperatures when the hole size was 0.25 mm in all of the conducted experiments.…”

“…The onset temperature extrapolated was determined from the cross-point of the tangent to the baseline with the tangent at the peak temperature [9]. The application of differential scanning calorimetry promotes a dynamic equilibrium, since the sample is submitted to a constant heating ramp through the whole thermal event, allowing for the PTx equilibrium data (total pressure measurements) to be obtained.…”

Vapor pressure data of nicotine, anabasine and cotinine using differential scanning calorimetry

“…Note that the importance of sample size has been also emphasized by other researchers. Another option to determine best sample size is from a leading edge slope (a slope of at least À3 mW/mg) as reported by Butrow and Seyler [20]. However, Brozena [21] has recently specified that this is not an ideal characteristic for finding the best pinhole size for lower pressure ranges.…”