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题名: Low-temperature heat capacities and thermodynamic properties of 2,2-dimethyl-1,3-propanediol
作者: Tong, B.;  Tan, Z.-C.;  Lv, X. C.;  Sun, L. X.;  Xu, F.;  Shi, Q.;  Li, Y. S.
关键词: adiabatic calorimetry ;  2,2-dimethyl-1,3-propanediol ;  DSC ;  heat capacity ;  phase transition ;  TG ;  thermodynamic properties
刊名: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
发表日期: 2007-10-01
DOI: 10.1007/s10973-006-7672-5
卷: 90, 期:1, 页:217-221
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The molar heat capacities C (p,m) of 2,2-dimethyl-1,3-propanediol were measured in the temperature range from 78 to 410 K by means of a small sample automated adiabatic calorimeter. A solid-solid and a solid-liquid phase transitions were found at T-314.304 and 402.402 K, respectively, from the experimental C (p)-T curve. The molar enthalpies and entropies of these transitions were determined to be 14.78 kJ mol(-1), 47.01 J K-1 mol(-1) for the solid-solid transition and 7.518 kJ mol(-1), 18.68 J K-1 mol(-1) for the solid-liquid transition, respectively. The dependence of heat capacity on the temperature was fitted to the following polynomial equations with least square method. In the temperature range of 80 to 310 K, C (p,m)/(J K-1 mol(-1))=117.72+58.8022x+3.0964x(2)+6.87363x (3)-13.922x(4)+9.8889x(5)+16.195x(6); x=[(T/K)-195]/115. In the temperature range of 325 to 395 K, C (p,m)/(J K-1 mol(-1))=290.74+22.767x-0.6247x 2-0.8716x 3-4.0159x 4-0.2878x 5+1.7244x 6; x=[(T/K)-360]/35. The thermodynamic functions H (T)-H (298.15) and S (T)-S (298.15), were derived from the heat capacity data in the temperature range of 80 to 410 K with an interval of 5 K. The thermostability of the compound was further tested by DSC and TG measurements. The results were in agreement with those obtained by adiabatic calorimetry.
关键词[WOS]: PHASE-TRANSITIONS
语种: 英语
WOS记录号: WOS:000249652300028
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140706
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.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
2.Dalian Jiaotong Univ, Coll Environm Sci & Engn, Dalian 116028, Peoples R China

Recommended Citation:
Tong, B.,Tan, Z.-C.,Lv, X. C.,et al. Low-temperature heat capacities and thermodynamic properties of 2,2-dimethyl-1,3-propanediol[J]. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,2007,90(1):217-221.
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