基于高功能组分的多孔聚合物的热降解行为和动力学,Journal of Applied Polymer Science

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基于高功能组分的多孔聚合物的热降解行为和动力学
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-02-20 , DOI: 10.1002/app.55304
Yumei Luo ₁ , Kefu Pu ₁ , Jie Gao ₁ , Yun Zhou ₁ , Jinyu Wan ₁ , Xiaodong Bai ₁

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基于高功能组分制备了两种多孔聚合物。热重分析（TGA）用于比较这两种材料的热降解行为和动力学。在氮气气氛下、不同升温速率下对硬质聚氨酯泡沫（H-RPUF）和聚脲气凝胶（H-PUA）进行热重测试。获得了多孔聚合物的热降解特性。采用无模型方法研究了多孔聚合物热降解的表观活化能（E _a ）。结果表明，H-RPUF的热降解温度和灰分含量均高于H-PUA，且挥发分含量较低。随着升温速率的升高，两种多孔聚合物的热滞效应较高，而挥发物的释放量没有变化。对于基辛格法，H-PUA和H-RPUF的E _{a分别为212.8 kJ mol}^-1和157.4 kJ mol ^-1。根据Starink法，H-PUA和H-RPUF的平均活化能分别为220.2 kJ mol ^-1和107.2 kJ mol ^-1。由Flynn-Wall-Ozawa模型得到，H-PUA和H-RPUF的平均活化能分别为219.0 kJ mol ^-1和111.5 kJ mol ^-1。三个模型得到的数据均表明H-PUA的热降解E _a高于H-RPUF，并且更不易分解。

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Thermal degradation behavior and kinetics of porous polymer based on high functionality components

Two kinds of porous polymer were prepared based on high functionality components. Thermogravimetric analysis (TGA) is used to compare the thermal degradation behavior and kinetics of these two materials. The thermogravimetric tests of rigid polyurethane foam (H-RPUF) and polyurea aerogel (H-PUA) were carried out in nitrogen atmosphere at different heating rates. The thermal degradation characteristics of the porous polymer were obtained. The apparent activation energy (E_a) of thermal degradation of the porous polymer was investigated by model-free methods. The results showed that the thermal degradation temperature and ash content of H-RPUF were higher than those of H-PUA, and the volatile content was lower. With the rise of heating rate, thermal hysteresis effect of the two porous polymer was relatively high, while the release amount of volatiles was unchanged. For the Kissinger method, E_a of H-PUA and H-RPUF was 212.8 kJ mol⁻¹ and 157.4 kJ mol⁻¹, respectively. According to Starink method, the average activation energy of H-PUA and H-RPUF was 220.2 kJ mol⁻¹ and 107.2 kJ mol⁻¹, respectively. Obtained by Flynn-Wall-Ozawa model, the average activation energy of H-PUA and H-RPUF was 219.0 kJ mol⁻¹ and 111.5 kJ mol⁻¹, respectively. The data obtained from the three models all show that E_a of thermal degradation of H-PUA is higher than that of H-RPUF, and it is less likely to decompose.

更新日期：2024-02-20

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