摘要
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12.76,12.96,11.81kJ·mol-1,从362.2℃开始开环分解、气化,气化热ΔH为2096.4J·g-1,分解质量损失的主要物质为m/z40～90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49.3J·g-1,固态比热容均值是1.469J·g-1K-1,液态为1.163J·g-1K-1,由固体变液体的相变比热容是4.
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 ahietic 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 abietie 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, 2096.4 J·g^-1, 1.469 J·g^-1 K^-1, 1. 163 J·g^-1 K^-1 and 4.769 J·g^-1 K^-1, respectively.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2012年第8期123-128,共6页
Scientia Silvae Sinicae
基金
国家“十二五”科技支撑项目(2012BAD32B05)
关键词
枞酸
热分析
热分解动力学
比热容
abietic acid
thermal analysis
thermal decomposition kinetics
heat capacity
