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Heat capacities and thermodynamic properties of 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid
Xue Bin1; Wang Jianya1; Tan Zhicheng1; Wu Tonghao1
2007
Source PublicationCHEMICAL RESEARCH IN CHINESE UNIVERSITIES
ISSN1005-9040
Volume23Issue:4Pages:460-464
AbstractThe heat capacities of 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid(a racemic mixture, molar ratio of cis-/trans-structure is 35/65) in a temperature range from 78 to 389 K were measured with a precise automatic adiabatic calorimeter. The sample was prepared with a purity of 98. 75% (molar fraction). A solid-liquid fusion phase transition was observed in the experimental temperature range. The melting point, T-m., enthalpy and entropy of fusion, (Delta)f(us)H(m), Delta S-fus(m), of the acid were determined to be (331.48 +/- 0.03) K, (16.321 +/- 0.031) kJ/mol, and (49.24 +/- 0.19) J/(K center dot mol), respectively. The thermodynamic functions of the sample, H-T - H-298.15, ST - S-298.15 and G(T) - G(298.15), were reported at a temperature intervals of 5 K. The thermal decomposition of the sample was studied using thermogravimetric(TG) analytic technique, the thermal decomposition starts at ca. 418 K and ends at ca. 544 K, the maximum decomposition rate was obtained at 510 K. The order of reaction, preexponential factor and activation energy are n 0.23, A = 7.3 x 10(7) min E = 70.64 kJ/mol, respectively.
Other AbstractThe heat capacities of 3 - (2,2-dichloroethenyl) -2,2-dimethylcyclopropanecarboxylic acid ( a racemic mixture,molar ratio of cis-/trans-structure is 35/65) in a temperature range from 78 to 389 K were measured with a precise automatic adiabatic calorimeter. The sample was prepared with a purity of 98.75% ( molar fraction). A solid-liquid fusion phase transition was observed in the experimental temperature range. The melting point, T_m, enthalpy and entropy of fusion, △_(fus)H_m, △_(fus)S_m, of the acid were determined to be ( 331.48 ± 0.03 ) K, ( 16. 321 ± 0.031 ) kJ/mol,and (49.24 ± 0.19) J/( K·mol), respectively. The thermodynamic functions of the sample, H_T - H_(298.15), S_T -S_(298.15) and G_T - G_(298.15), were reported at a temperature intervals of 5 K. The thermal decomposition of the sample was studied using thermogravimetric (TG) analytic technique, the thermal decomposition starts at ca. 418 K and ends at ca. 544 K, the maximum decomposition rate was obtained at 510 K. The order of reaction, preexponential factor and activation energy are n =0.23, A =7. 3 × 10~7 min~(-1), E =70.64 KJ/mol, respectively.
Keyword3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid adiabatic calorimetry heat capacity thermodynamic function thermal decomposition
Indexed ByCSCD
Language英语
CSCD IDCSCD:3005694
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/141970
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.吉林大学
3.中国科学院
Recommended Citation
GB/T 7714
Xue Bin,Wang Jianya,Tan Zhicheng,et al. Heat capacities and thermodynamic properties of 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid[J]. CHEMICAL RESEARCH IN CHINESE UNIVERSITIES,2007,23(4):460-464.
APA Xue Bin,Wang Jianya,Tan Zhicheng,&Wu Tonghao.(2007).Heat capacities and thermodynamic properties of 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid.CHEMICAL RESEARCH IN CHINESE UNIVERSITIES,23(4),460-464.
MLA Xue Bin,et al."Heat capacities and thermodynamic properties of 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid".CHEMICAL RESEARCH IN CHINESE UNIVERSITIES 23.4(2007):460-464.
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