Register
ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2009,Vol.25>> Issue(12)>> 2417-2421     doi: 10.3866/PKU.WHXB20091120         中文摘要
Enthalpy of Formation, Heat Capacity and Entropy of Melamine
LIU Peng, XIONG Wei, HU Shan-Zhou, LI Xi, TAN Zhi-Cheng
Deparment of Chemistry, School of Sciences, Wuhan University of Technology, Wuhan 430070, P. R. China; Thermochemisty Laboratory and China Ionic Liquid Laoratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China
Download: PDF (263KB) Export: BibTeX | EndNote (RIS)

The thermodynamic properties of melamine were studied by multiple thermochemical 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: △cHΘm=(-2455.17±4.65) kJ·mol-1; △fHΘm =(-763.38±5.16) kJ·mol-1. The bond enthalpy of C≈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 △fHΘm 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.



Keywords: Heat capacity   Melamine   Combustion heat   Adiabatic calorimeter  
Received: 2009-07-10 Accepted: 2009-08-09 Publication Date (Web): 2009-09-28
Corresponding Authors: LIU Peng Email: chemliup@whut.edu.cn


Cite this article: LIU Peng, XIONG Wei, HU Shan-Zhou, LI Xi, TAN Zhi-Cheng. Enthalpy of Formation, Heat Capacity and Entropy of Melamine[J]. Acta Phys. Chim. Sin., 2009,25 (12): 2417-2421.    doi: 10.3866/PKU.WHXB20091120
1. GAO Xiao-Han, XU Pei, DUAN Wen-Chao, LÜ Xue-Chuan, TAN Zhi-Cheng, LU Qiang.Low-Temperature Heat Capacity and Thermodynamic Functions of Ho(NO3)3(C2H5O2N)4·H2O[J]. Acta Phys. Chim. Sin., 2013,29(10): 2123-2128
2. ZHANG Guo-Chun, ZHOU Chun-Sheng, GAO Sheng-Li.Low Temperature Heat Capacities and Standard Molar Enthalpy of Formation of the Coordination Compound Zn(Met)3(NO3)2·H2O(s)(Met=L-α-Methionine)[J]. Acta Phys. Chim. Sin., 2013,29(10): 2129-2134
3. LI Shang, WANG Jia-Tang, CHEN Rui-Xin, ZHAO Wei, QIAN Liu, PAN Mu.Catalytic Performance of Heat-Treated Fe-Melamine/C and Fe-g-C3N4/C Electrocatalysts for Oxygen Reduction Reaction[J]. Acta Phys. Chim. Sin., 2013,29(04): 792-798
4. LIU Bei-Ping, TAN Zhi-Cheng.Thermodynamic Properties of Nd(Gly)2Cl3·3H2O and Pr(Ala)3Cl3·3H2O[J]. Acta Phys. Chim. Sin., 2013,29(01): 17-22
5. CHEN Zhong-Xiu, CAO Chen, DENG Shao-Ping.Chaotrope-Assisted Color Visualization Mechanism and Thermodynamics Involved in Molecular Recognition of Melamine by Bolaamphiphiles Embedded in Polydiacetylene Vesicles[J]. Acta Phys. Chim. Sin., 2012,28(06): 1320-1328
6. XU Fen, QIU Shu-Jun, LIANG Jian-Guo, WU Rui-Hua, SUN Li-Xian, LI Fen.Low Temperature Heat Capacity and Thermal Analysis of Caffeine, Theophylline and Aminophylline[J]. Acta Phys. Chim. Sin., 2010,26(08): 2096-2102
7. LV Xue-Chuan, TAN Zhi-Cheng, GAO Xiao-Han.Synthesis and Thermochemical Properties of New Ternary Lanthanum Complex La(Glu)(Im)6(ClO4)3·4HClO4·4H2O[J]. Acta Phys. Chim. Sin., 2009,25(10): 1945-1950
8. ZHONG Ai-Guo, WU Jun-Yong, YAN Hua, JIN Yan-Xian, DAI Guo-Liang, JIANG Hua-Jiang, PAN Fu-You, LIU Shu-Bin.Structure, UV-Vis Spectroscopy and Reactivity Properties of MelamineMetal(II) Complexes[J]. Acta Phys. Chim. Sin., 2009,25(07): 1367-1372
9. XU Kang-Zhen; ZHAO Feng-Qi; REN Ying-Hui; MA Hai-Xia; SONG Ji-Rong; HU Rong-Zu.Thermal Behavior, Specific Heat Capacity and Adiabatic Time-to-Explosion of 3,6-Dihydrazino-1,2,4,5-tetrazine[J]. Acta Phys. Chim. Sin., 2009,25(02): 309-313
10. DI You-Ying; KONG Yu-Xia; ZHANG Shuang; YANG Wei-Wei; WU En-Shen; SHI Quan; TAN Zhi-Cheng.Synthesis, Characterization and Thermochemistry of the Hydrated Barium Nicotinate[J]. Acta Phys. Chim. Sin., 2008,24(10): 1884-1890
11. TONG Bo; TAN Zhi-Cheng; WANG Shao-Xu.Thermodynamic Properties of 1-Docosanol[J]. Acta Phys. Chim. Sin., 2008,24(09): 1699-1702
12. ZHANG Jing-Nan; TAN Zhi-Cheng; LIU Bei-Ping; SHI Quan; TONG Bo.Low-Temperature Heat Capacities and Thermochemistry Properties of Sm(Val)Cl3·6H2O[J]. Acta Phys. Chim. Sin., 2008,24(08): 1378-1382
13. DI You-Ying; GAO Sheng-Li; TAN Zhi-Cheng.Low-temperature Heat Capacities and Standard Molar Enthalpy of Formation of the Complex Zn(Phe)(NO3)2·H2O(s)[J]. Acta Phys. Chim. Sin., 2007,23(09): 1437-1441
14. YUE Dan-Ting;TAN Zhi-Cheng;LI Yan-Sheng .Low-Temperature Heat Capacity and Thermodynamic Functions of Nano Fe[J]. Acta Phys. Chim. Sin., 2006,22(11): 1427-1430
15. WANG Mei-Han; TAN Zhi-Cheng; SUN Xiao-Hong; SUN Li-Xian; LIU Yuan-Fa; ZHANG Tao.Thermodynamic Studies of 4-pyridinemethanol[J]. Acta Phys. Chim. Sin., 2005,21(05): 573-576
16. YUE Dan-Ting; TAN Zhi-Cheng; DONG Li-Na; SUN Li-Xian; ZHANG Tao.Low-temperature Heat Capacity and Thermodynamic Functions of Nano ZnO[J]. Acta Phys. Chim. Sin., 2005,21(04): 446-449
17. XU Fen;SUN Li-Xian;TAN Zhi-Cheng;LI Rui-Lian;TIAN Qi-Feng;ZHANG Tao.Low Temperature Heat Capacity of (S)-ibuprofen[J]. Acta Phys. Chim. Sin., 2005,21(01): 1-5
18. Nan Zhao-Dong;Tan Zhi-Cheng;Sun Li-Xian.Thermodynamic Investigation of the Azeotrope of Water and Ethanol[J]. Acta Phys. Chim. Sin., 2004,20(06): 626-630
19. Nan Zhao-Dong;Tan Zhi-Cheng;Sun Li-Xian.Thermodynamic Investigation of the High Efficient Working Fluid Used for a Heat Pipe[J]. Acta Phys. Chim. Sin., 2003,19(09): 883-885
20. Liu Bei-Ping;Tan Zhi-Cheng;Yu Hua-Guang;Lan Xiao-Zheng;Zhang Da-Shun;Liu Ping;Sun Li-Xian.Thermodynamic Properties of [Ho2(Ala)4(H2O)8]Cl6 (Ala=alanine)[J]. Acta Phys. Chim. Sin., 2003,19(05): 445-449
21. Nan Zhao-Dong;Tan Zhi-Cheng;Sun Li-Xian.Low Temperature Heat Capacities and Thermodynamic Functions of Potassium Dichromate[J]. Acta Phys. Chim. Sin., 2002,18(10): 947-951
22. Liu Bei-Ping;Tan Zhi-Cheng;Nan Zhao-Dong;Liu Ping;Sun Li-Xian;Xu Fen.Calorimetric Study and Thermal Analysis of [Ho2(Ala)4(H2O)8]Cl6 and >;[ErY(Ala)4(H2O)8](ClO4)6[J]. Acta Phys. Chim. Sin., 2002,18(06): 481-485
23. Liu Hai-Bo, Hou Zhan-Jia, Liu Li-Ying, Xu Zhi-Ling, Xu Lei, Wang Wen-Cheng, Li Fu-Ming, Ye Ming-Xin.Optical Properties of Melamine Formaldehyde Resin[J]. Acta Phys. Chim. Sin., 2000,16(06): 563-567
24. Chen Feng,Yang Zhang-Yuan,Wen Hao;Xu Zhi-Hao.A New Method to Estimate Thermodynamic Properties of Intermetallic Compounds[J]. Acta Phys. Chim. Sin., 1997,13(08): 712-716
25. Yin Zhou-Lan,Chen Qi-Yuan,Zhang Heng-Zhong,Zhang Ping-Min.Measurement of the Heat Capacity of Ammonium Tetramolybdate in the Micro Power Form[J]. Acta Phys. Chim. Sin., 1997,13(05): 455-458
26. Sun Hong-Wei,Gao Ming-Shu.Measurement and Computation of Excess Heat Capacity of Nonassociation Binary Liquid Mixture[J]. Acta Phys. Chim. Sin., 1997,13(03): 264-269
27. Yan Zhan-Xian,Zhou Xiao-Qing,Dai Wei,Chen Ci-Xing.Theoretical Research on Optical,Thermal and Magnetic Properties of Ni(pz)4Cl2 Complex[J]. Acta Phys. Chim. Sin., 1996,12(11): 995-1000
28. Sun Hong-Wei,Gao Ming-Shu,Ma Pei-Sheng.Measurement and Investigation of Heat Capacity and Excess Heat Capacity of Binary Liquid Mixture[J]. Acta Phys. Chim. Sin., 1996,12(06): 537-542
29. Shao Shuang,Yu Qing-Sen,Fang Wen-Jun,Lin Rui-Sen.Measurement and Study on the Vapor Heat Capacities of Carboxylic Acids[J]. Acta Phys. Chim. Sin., 1996,12(02): 169-172
30. Gu Jian-De,Muhammad Ashraf Khan,Tian An-Min,Yan Guo-Sen.Quantum Correction for the Heat Capacity of Liquid Water[J]. Acta Phys. Chim. Sin., 1995,11(06): 509-515
31. Xu Rui-Yun; Kong De-Jun; Cai Xian-E; Zhu Jing.Measurement of Capacitied for (n-C18H37NH3)2MCl4[J]. Acta Phys. Chim. Sin., 1993,9(06): 802-807
32. Ding Yi-Ming; Yu Qing-Sen; Lin Rui-Sen; Zong Han-Xing.A Set of Vapor-Flow Calorimeter and the Heat Capacities of Benzene and Benzene-Cyclohexane[J]. Acta Phys. Chim. Sin., 1993,9(04): 542-547
Copyright © 2006-2014 Editorial office of Acta Physico-Chimica Sinica
Address: College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R.China
Service Tel: +8610-62751724 Fax: +8610-62756388 Email:whxb@pku.edu.cn
^ Top