DSC by the TGA/SDTA851(e) considering mass changes

DSC measurements in open pans are often disturbed by mass losses such as su blimation during melting or release of water during chemical reactions. By simultaneous DSC and TG measurements the DSC signal can be corrected. For t his purpose, a temperature dependent calibration function has to be determi ned by which the SDTA signal from the TGA/SDTA851(e) measuring cell can be converted into a heat flow curve (DSC). By this procedure, accurate heat of melting can be determined despite ongoi ng sublimation in open pans. This method is illustrated with reference of t he melting of anthracene. Additionally, condensation reactions were investigated and analyzed by DSC/ TG even under ambient pressure, knowing the heat of evaporation. Using phen ol formaldehyde resins the influence of the presence or the release of vola tile reaction products on the reaction rate and kinetic parameters were stu died. In general, the method can be used to correct DSC curves for thermal effect s related to mass change.