| 基于热重分析法的苯基硅橡胶热分解行为研究 |
| Study on Thermal Decomposition Behavior of Phenyl Silicone Rubber by TGA |
| 投稿时间：2020-08-21 修订日期：2020-08-21 |
| DOI：10.12136/j.issn.1000-890X.2021.09.0699 |
| 中文关键词: 甲基乙烯基苯基硅橡胶 热分解 动力学 表观活化能 热重分析法 反应机理函数 |
| 英文关键词: methylvinyl phenyl silicone rubber thermal decomposition kinetics apparent activation energy TGA reaction mechanism function |
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| 中文摘要: |
| 基于热重分析法研究甲基乙烯基苯基硅橡胶（简称苯基硅橡胶）的热分解动力学。结果表明：苯基硅橡胶在空气中的热分解有一个质量损失平台，热分解温度随升温速率的增大而提高；采用Flynn-Wall-Ozawa和Friedman法，在不涉及反应机理函数的条件下，分析得到苯基硅橡胶在转化率（α）为30%～70%时的表观活化能（Ea）平均值分别为178.071 8和179. 826 8 kJ·mol-1，采用Kissinger法的最大热质量损失理论公式计算得到苯基硅橡胶的Ea为182. 633 kJ·mol-1，3种方法所得的Ea具有较好的一致性；结合Coats-Redfern法得出苯基硅橡胶在空气中热分解反应为三维扩散控制，该法的理想反应机理函数应为g（α）＝[（1＋α）－1/3－1]2。 |
| 英文摘要: |
| The thermal decomposition kinetics of methylvinyl phenyl silicone rubber（phenyl silicone rubber for short） was studied based on thermogravimetric analysis（TGA）. The results showed that the thermal decomposition of phenyl silicone rubber in the air had a mass loss platform，and the thermal decomposition temperature increased with the increase of the heating rate. Using Flynn-Wall-Ozawa and Friedman methods，and under the condition that the reaction mechanism function was not involved，the average apparent activation energy（Ea） of phenyl silicone rubber at 30% ～ 70% conversion rate（α） was 178. 071 8 and 179. 826 8 kJ·mol-1 respectively. The Ea of phenyl silicone rubber calculated by maximum thermal mass loss theoretical formula of Kissinger method was 182. 633 kJ·mol-1. The Ea obtained by the three methods had good consistency. Combined with Coats-Redfern method，the thermal decomposition reaction of phenyl silicone rubber in the air was controlled by three-dimensional diffusion，and the ideal reaction mechanism function of this method should be （α）＝[（1＋α）－1/3－1]2. |
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