Zhang Wei, Zang Yang, Lu Yanli, Lin Weisheng, Zhao Shengyun, Xiong Jinping
School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
School of Ecology and Resource Engineering, Wuyi University, Mount Wuyi, Nanping 354300, China.
Materials (Basel). 2021 Nov 10;14(22):6767. doi: 10.3390/ma14226767.
The thermal decomposition of brominated butyl rubber under air atmosphere was investigated by thermogravimetry (TG) and derivative thermogravimetry (DTG) at various heating rates. The kinetic parameters were evaluated by TG and the isoconversional method developed by Ozawa. One prominent decomposition stage was observed in the DTG curves at high heating rates, while an additional small peak was observed at low heating rates. The apparent activation energy determined using the TG method ranged from 219.31 to 228.13 kJ·mol at various heating rates. The non-isothermal degradation was found to be a first-order reaction, and the activation energy, as determined by the isoconversional method, increased with an increase in mass loss. The kinetic data suggest that brominated butyl rubber has excellent thermal stability. This study can indirectly aid in improving rubber pyrolysis methods and in enhancing the heat resistance of materials.
通过热重分析法（TG）和微商热重分析法（DTG）在不同升温速率下研究了溴化丁基橡胶在空气气氛中的热分解。利用TG和小泽提出的等转化率方法评估了动力学参数。在高升温速率下的DTG曲线中观察到一个明显的分解阶段，而在低升温速率下观察到一个额外的小峰。使用TG方法测定的表观活化能在不同升温速率下为219.31至228.13 kJ·mol。发现非等温降解为一级反应，通过等转化率方法测定的活化能随质量损失的增加而增加。动力学数据表明溴化丁基橡胶具有优异的热稳定性。本研究可间接有助于改进橡胶热解方法并提高材料的耐热性。
