Abstract Flexible polyurethane foams (FPUFs) have been modified to contain layered double hydroxides (LDHs) by dihydrogen phosphate (H2PO4 −). The thermal stability of the prepared foams has been characterized using thermogravimetric analysis (TGA) at 5, 10, 20, 30, and 40 °C/min heating rates. The experimental data indicate that the temperature range for the two pyrolysis stages of FPUF is about 212–350 °C and 350–565 °C, respectively. Integral programmed decomposition temperature (IPDT) has been calculated according to the measured data, which was found that the IPDT of the modified FPUF was increased to 526 °C. Additionally, the thermal stability of FPUF composite has been also evaluated by the activation energy (E) on the basis of the pyrolysis kinetics of FPUF composites during thermal decomposition using Coats–Redfern integral method. These results manifest that the presence of intercalated LDHs enhances the thermal stability of FPUF.

中文翻译：

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含有改性层状双氢氧化物和硼酸锌的软质聚氨酯泡沫的热稳定性

摘要 软质聚氨酯泡沫 (FPUF) 已被磷酸二氢 (H2PO4 -) 改性为含有层状双氢氧化物 (LDH)。已使用热重分析 (TGA) 在 5、10、20、30 和 40 °C/min 加热速率下表征所制备泡沫的热稳定性。实验数据表明，FPUF 两个热解阶段的温度范围分别约为 212-350°C 和 350-565°C。根据实测数据计算积分程序分解温度（IPDT），发现改性FPUF的IPDT提高到526℃。此外，还使用 ​​Coats-Redfern 积分法根据 FPUF 复合材料在热分解过程中的热解动力学，通过活化能 (E) 评估了 FPUF 复合材料的热稳定性。