Heat Capacities and Thermodynamic Properties of 3-(2,2-Dichloroethenyl ) -2,2-dimethylcyclopropanecarboxylic Acid
查看参考文献9篇
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文摘
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The 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. |
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来源
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Chemical Research in Chinese Universities
,2007,23(4):460-464 【核心库】
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DOI
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10.1016/s1005-9040(07)60099-3
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关键词
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3-( 2,2 -Dichloroethenyl ) -2,2 -dimethylcyclopropanecarboxylic acid
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Adiabatic calorimetry
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Heat capacity
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Thermodynamic function
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Thermal decomposition
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地址
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1.
School of Petrochemical Engineering, Shenyang University of Technology, Liaoyang, 111003
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Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023
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College of Chemistry, Jilin University, Changchun, 130021
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1005-9040 |
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学科
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化学 |
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基金
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辽宁省教育厅科学基金
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文献收藏号
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CSCD:3005694
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