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题名: Enthalpy of Formation, Heat Capacity and Entropy of Melamine
作者: Liu Peng1;  Xiong Wei1;  Hu Shan-Zhou1;  Li Xi1;  Tan Zhi-Cheng2
关键词: Heat capacity ;  Melamine ;  Combustion heat ;  Adiabatic calorimeter
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 2009-12-01
DOI: 10.3866/PKU.WHXB20091120
卷: 25, 期:12, 页:2417-2421
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The thermodynamic properties of melamine were studied by multiple thermochernical methods. A bomb combustion calorimeter was used to determine the combustion heat of melamine at 298.15 K. According to the results, we calculated the standard molar enthalpy of combustion and standard molar enthalpy of formation of melamine: Delta H-c(m)Theta=(-2455.17 +/- 4.65) kJ mol(-1); Delta H-f(m)Theta=(-763.38 +/- 5.16) kJ.mol(-1). The bond enthalpy of C approximate to N (between single bond and double bond) in melamine was then estimated to be 458.30 kJ.mol(-1) according to the ralationship between bond enthalpy and combustion enthalpy. This value is larger than that of C-N but smaller than that of C=N. Heat capacity measurements were carried out in a small sample adiabatic calorimeter from 80 to 385 K. We obtained Delta H-f(m)Theta at different temperatures between 80 and 385 K using the heat capacity data. Through calculation with the values of heat capacity, the relationship between the standard molar enthalpy of formation and temperature is also presented as a functional equation. We also measured the thermol stability of melamine by the thermogravimetry-differential scanning calorimetry (TG-DSC) technique, which showed a thermal decomposition peak at 603.37 K for the DSC curve.
关键词[WOS]: ACID ;  TOXICITY ;  NITROGEN ;  SAMPLES ;  RESIN ;  CATS
语种: 英语
WOS记录号: WOS:000272817500003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141285
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Wuhan Univ Technol, Sch Sci, Dept Chem, Wuhan 430070, Hubei, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab & China Ion Liquid Laoratory, Dalian 116023, Liaoning Prov, Peoples R China

Recommended Citation:
Liu Peng,Xiong Wei,Hu Shan-Zhou,et al. Enthalpy of Formation, Heat Capacity and Entropy of Melamine[J]. ACTA PHYSICO-CHIMICA SINICA,2009,25(12):2417-2421.
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