Estimativa por DSC das entalpias de sublimação da etilenouréia e da propilenouréia: algumas correlações empíricas envolvendo amidas e tioamidas Estimative by DSC data of the sublimation enthalpies for ethyleneurea and propyleneurea: some empirical correlations with amides and tioamides
<abstract language="eng">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, th...
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Format: | Article |
Language: | English |
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Sociedade Brasileira de Química
1999-07-01
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Series: | Química Nova |
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Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000400008 |
Summary: | <abstract language="eng">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: <FONT FACE="Symbol">D</font>crg Hmo (1)/ <FONT FACE="Symbol">D</font>crg Hmo (2) = <FONT FACE="Symbol">D</font>lg Hmo (1)/ <FONT FACE="Symbol">D</font>lg 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. |
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ISSN: | 0100-4042 1678-7064 |