As an energy-efficient building material, rigid polyurethane foam (RPUF) has attracted attention. However, there are still great challenges in how to easily prepare RPUF materials with good mechanical properties, flame retardant properties, thermal insulation and other properties. In the current work, expandable graphite (EG)-modified lignin-based polyol (RPUF) was prepared by a one-step method. Thermogravimetric analysis was used to study the pyrolysis of modified foams under nitrogen conditions. It was found that the RPUF-4 with an EG of 10 wt% had the highest the apparent activation energy (E), integral procedural decomposition temperature (IPDT), initial temperature and residue rate. And RPUF-4 also had excellent thermal insulation properties. In addition, RPUF-4 exhibited excellent flame retardancy and smoke suppression properties (peak heat release rate (RHRR), total heat release rate (THR) and Ds were 65.46 %, 23.92 % and 45.94 % lower than those of the unadded RPUF, respectively). At the same time, RPUF-4 also had good mechanical properties and energy absorption properties. These results will lay the foundation for the development and application of RPUF in the field of building insulation.

中文翻译：

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可膨胀石墨改性生物基硬质聚氨酯泡沫的热力学性能及阻燃分析


作为一种节能建筑材料，硬质聚氨酯泡沫（RPUF）备受关注。然而，如何轻松制备出具有良好机械性能、阻燃性能、隔热性能等性能的RPUF材料仍存在很大挑战。在目前的工作中，通过一步法制备了可膨胀石墨（EG）改性木质素基多元醇（RPUF）。采用热重分析研究了改性泡沫在氮气条件下的热解情况。结果发现，EG含量为10 wt%的RPUF-4具有最高的表观活化能（E）、积分程序分解温度（IPDT）、初始温度和残留率。并且RPUF-4还具有优异的隔热性能。此外，RPUF-4表现出优异的阻燃和抑烟性能（峰值热释放率（RHRR）、总热释放率（THR）和Ds分别比未添加的RPUF低65.46%、23.92%和45.94% ）。同时，RPUF-4还具有良好的力学性能和能量吸收性能。这些成果将为RPUF在建筑保温领域的开发和应用奠定基础。