THERMOGRAVIMETRIC EXAMINATION OF POLYALCOHOL-FORMATE BINARY-SYSTEMS

Mixtures of trimethylolpropane (TMP) or pentaerythritol (PER) with sod ium or calcium formate (SF or CF) were investigated all over their com position range. Complete additivity was found to occur in the case of the TMP-SF and TMP-CF systems which renders it possible to determine t he contents of both TMP and the given formate from independent signals of weight loss over the entire range of quantitative composition of t he mixtures under investigation. Additivity was found not to occur in the PER-SF system in the entire range of quantitative composition; SF content could only be determined from the ash weight. In the PER-CF sy stem, additivity was absent at some signals; CF content could be deter mined in the full range from three independent signals, PER could be d etermined independently only at its content up to 50% by weight.