THERMOGRAVIMETRIC ANALYSIS FOR BOILING POINTS AND VAPOR-PRESSURE

A TGA instrument has been adapted for rapid measurement of boiling poi nts and vapour pressure at temperatures from ambient up to 400 degrees C and pressures from ambient down to 20 mm Hg. Samples were contained in sealed holders having a laser-drilled aperture. Several organic li quids in the 100 to 300 g MW range showed good agreement with referenc e vapour pressure data. Sample mass, heating rate, and use of inert di luents were important variables affecting accuracy of vapour pressure measurements.