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Estimativa por DSC das entalpias de sublimação da etilenouréia e da propilenouréia: algumas correlações empíricas envolvendo amidas e tioamidas

1999; Brazilian Chemical Society; Volume: 22; Issue: 4 Linguagem: Inglês

10.1590/s0100-40421999000400008

1678-7064

Robson Fernandes de Farias,

Thermal and Kinetic Analysis

By using DSC data, the enthaplies of sublimation for ethyleneurea and propyleneurea, are calculated as 84 and 89 kJ mol-1 respectively. Using the vaporization enthalpy values for dimethylethyleneurea and dimethylprophyleneurea, as obtained from literature, the empirical relation: Dcrg Hmo (1)/ Dcrg Hmo (2) = Dlg Hmo (1)/ Dlg Hmo(2) = constant, that relate sublimation or vaporization enthalpies of two different substances and of its methylated derivatives, is obtained. Correlations like that are found to another ureas and thioureas.