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采用红外傅立叶变换光谱仪与热重分析仪联动装置在线检测HNO3-CH3COOH-GIC、H2SO4-GIC及H2SO4-CH3COOH-GIC等插层石墨的相变及热分解过程,同时通过快速扫描得到相应时间段内分解产物的红外光谱,并运用Kissinger-Ozawa原理计算了几种典型膨化反应的动力学参数。研究结果揭示了膨化过程的热分解机理,当升温速率在20℃/min~80℃/min范围时,由实验数据计算出膨化反应表观活化能不大于120kJ/mol。
The phase transition and thermal decomposition of HNO3-CH3COOH-GIC, H2SO4-GIC and H2SO4-CH3COOH-GIC intercalated graphite were detected on-line by the infrared Fourier transform spectrometer and thermogravimetric analyzer. At the same time, The infrared spectrum of the product was decomposed and the kinetic parameters of several typical puffing reactions were calculated using the Kissinger-Ozawa principle. The results reveal the thermal decomposition mechanism of the puffing process. When the heating rate is between 20 ℃ / min and 80 ℃ / min, the apparent activation energy of the puffing reaction is not more than 120 kJ / mol calculated from the experimental data.