Thermal analysis of polyols. II

The DTA, TG, DTG and electric conductivity curves of pentaerythritol (I), 1,3-dihydroxy-2-methylol-2-ethylpropane(II) and 1,3-dihydroxy-2-methylol-2-methylpro-pane(III) have been taken for the first time. Pentaerythritol undergoes a polymorphous change on heating, 1,3-dihydroxy-2-methylol-2-methylpropane forms a syrup in a narrow temperature interval before melting and 1,3-dihydroxy-2-methylol-2-ethylpropane melts with formation of a glass on cooling. The sublimation of substances was also observed.