使用纯度99.32%的环状二萜化合物枞酸样品,通过TG,DCS,TG-MS研究枞酸的热分解反应和反应机制,得到其热分解反应的活化能Ea在质量损失20%,40%,60%时分别为12.76, 12.96, 11.81 kJ·mol-1,从362.2 ℃开始开环分解、气化,气化热ΔH为2 096.4 J·g-1,分解质量损失的主要物质为m/z 40~90的小分子,分解反应过程首先是脱去异丙基、羧基,然后开环分解,枞酸受热的相变过程中融熔热ΔH为49.3 J·g-1,固态比热容均值是1.469 J·g-1K-1,液态为1.163 J·g-1K-1,由固体变液体的相变比热容是4.769 J·g-1K-1。
The decomposition reaction and mechanism of abietic acid with the purity 99.32% was tested by thermogravimetric analysis (TG),differential scanning calorimetry (DSC) and thermogravimetric analyzer coupled to a quadrupole mass spectrometer (TG-MS). The thermal decomposition activation energy of abietic acid at 20%(TG), 40%(TG), 60%(TG) were 12.76, 12.96, 11.81 kJ·mol-1, respectively. The results of TG-MS showed that there are micromolecules, whose m/z are between 40 to 90 when decomposed after 362.2 ℃, which proved that the decomposition process of abietic acid is first off isopropyl, carboxyl, and then open-ring. The fusion heat, heat of gasification, heat capacity of solid state, liquid state and phase change form solid to liquid were 49.3 J·g-1, 2 096.4 J·g-1, 1.469 J·g-1K-1, 1.163 J·g-1K-1 and 4.769 J·g-1K-1, respectively.
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