3-硝基邻苯二甲酸铅的热分解机理(英文)

Thermal Decomposition Mechanism of Lead(Ⅱ)3-Nitro-phthalate

采用实时DSC-TG-MS连用技术和热分解原位快速傅里叶变换红外光谱研究了3-硝基邻苯二甲酸铅的热分解机理。结果表明,在热分解过程中,羧基首先在299.9℃左右从3-硝基邻苯二甲酸铅上脱去,产生PbO、CO2和硝基芳香酮基;而后在312.8℃左右时,酮从硝基芳香酮基上脱去,产生CO和硝基芳香基;接着,硝基芳香基发生C-NO2的均裂和硝基的重排反应,产生NO、苯基和苯酚基;最后,苯基和苯酚基热分解产生CO2、CO、C和其他残留物。

The thermal decomposition mechanism of lead 3-nitro-phthalate （LNPH） was studied by means of simultaneous DSCTG-MS and thermolysis in-situ rapid-scan Fourier transform infrared spectroscopy （thermolysis /RSFTIR） techniques.Results showed that the carboxyl group was firstly eliminated from LNPH at the temperature of approximately 299.9℃,producing PbO,CO2 and nitro aromatic ketone radicals.Thereafter,the ketone group was eliminated from the nitro aromatic ketone radical at around 312.8℃ with the products of CO and nitro aromatic radical.Continually,the aromatic radical would mainly undergo the ho molysis reaction of C-NO2 and rearrangement of the nitro （NO2） group to the nitrite （ONO）,generating NO,phenyl radical and phenol radical.At last,the pyrolysis of phenyl radical and phenol radical occurred,resulting in CO2,CO,carbon and some other residues.