Heat capacities of urea, N-methylurea, N-ethylurea, N-(n)propylurea, and N-(n)butylurea in the range 200 to 360 K
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- 作者：Ferloni ; Paolo ; Della Gatta ; Giuseppe
- 关键词：DSC ; Heat capacity ; N-(mono)alkylureas ; Phase transitions ; Urea
- 刊名：Thermochimica Acta
- 出版年：1995
- 出版时间：November 15, 1995
- 年：1995
- 卷：266
- 期：Complete
- 页码：203-212
- 全文大小：474 K
文摘
The heat capacities at constant pressure of urea, N-methylurea, N-ethylurea, N-(n)propylurea and N-(n)butylurea were measured by differential scanning calorimetry over the range 200-360 K, in gas-flow conditions. A He + Ne mixture and N2 only were selected as the purge gases below and above room temperature, respectively. Benzoic acid was used as the reference material and the accuracy of the measurements was estimated to be within 2 % across the temperature range. The heat capacities at 298.15 K were obtained by interpolating the smoothed fitting equations.