Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2010-02-20

Journal: THERMOCHIMICA ACTA

Included Journals: EI、SCIE

Volume: 499

Issue: 1-2

Page Number: 117-122

ISSN: 0040-6031

Key Words: Adonitol; Phase transition; Adiabatic calorimetry; Oxygen-bomb combustion calorimetry; DSC; TGA

Abstract: Adonitol was investigated by adiabatic calorimetry (AC), differential scanning calorimetry (DSC), thermogravity analysis (TGA) and oxygen-bomb combustion calorimetry. The heat capacity was precisely measured in the temperature range from 78 to 400 K by means of a small sample automated adiabatic calorimeter. The melting temperature, the molar enthalpy and entropy of this transition were determined to be T=369.08 +/- 0.45 K. 36.42 +/- 0.18 kJ mol(-1) and 98.68 +/- 0.49 JK(-1) mol(-1) respectively from the experimental C(p)-T curve. The thermodynamic functions [H(T)(0) - H(298.15)(0)] and [S(T)(0) - S(298.15)(0)] were derived from the heat capacity data with an interval of 5 K. The Standard molar enthalpy of combustion and formation of the compound have been determined to be Delta(c)H(m)(0), (C(5)H(12)O(5)center dot cr)=(-2562.4+/-1.3)kJ mol(-1) and Delta(c)H(m)(0) (C(5)H(12)O(5).cr)=(-1120.1+/-1.5)kJ mol(-1) respectively by means of a precision oxygen-bomb combustion calorimeter at T=298.15 K. The thermostability of the compound was further studied by DSC and TGA measurements. (C) 2009 Published by Elsevier B.V.