Thermal response of the honeycomb sandwich structure was evaluated using the steady-state method at different temperatures ranging from 100°C to 400°C. The results showed that effective thermal conductivity decreases when the temperature set is over 300°C, and the critical temperature is about 310°C. As a result, a set of experiments was conducted to observe the inner structure of the sandwich in a quest to understand why the thermal conductivity decreases. A black substance was found, and it adhered to the interfaces between the faces and the core where the adhesive is located. A series of experiments were carried out to study the thermal response of the adhesive. The TG curves showed that the total mass loss of adhesive can reach 90% due to the thermal decomposition, which can absorb a portion of energy. Meanwhile, the black substance was also produced during the TG measurements and its carbon content reached 64.38%.

中文翻译：

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胶粘蜂窝夹芯结构高温热响应研究

在 100°C 至 400°C 的不同温度下，使用稳态方法评估蜂窝夹层结构的热响应。结果表明，当设定温度超过300°C时，有效导热系数降低，临界温度约为310°C。因此，进行了一组实验来观察夹层的内部结构，以了解导热率降低的原因。发现了一种黑色物质，它粘附在粘合剂所在的面和核心之间的界面上。进行了一系列实验来研究粘合剂的热响应。TG曲线表明，由于热分解，粘合剂的总质量损失可以达到90%，可以吸收一部分能量。同时，