ABSTRACT The behavior of rPUf (polyurethane foam derived from bis(2-hydroxyethyl) terephthalate (BHET) recovered from post-consumer poly(ethylene terephthalate)-PET bottles) and cPUf (polyurethane foam based on a commercial polyol) were evaluated by comprehensive characterizations, and their thermal stabilities, flammabilities, and physical properties were compared. Without using a flame retardant, rPUf passed the UL-94HB standard, whereas cPUf burned rapidly to the holding clamp. Various formulations of rPUf and cPUf with established eco-friendly fire retardants (FRs), including triphenyl phosphate, aluminum diethylphosphinate, and aluminum trihydroxide, exhibited notably higher fire resistance. The differences between the experimental and calculated densities showed the effectiveness of the foaming process. A larger difference indicated that the FR improved the foaming process more. The BHET structure contains an aromatic moiety that strongly enhanced the compressive strength and protected the rPUf/FRs from biodegradation, as evidenced by sorption isotherm experiments. For that reason, the rPUf/FRs could be used as building materials, especially under high humidity conditions. These are the advantages of BHET over the commercial polyol for PUf preparation. Chemical recycle of post-consumer PET bottles to produce high performance PUf could be applied on an industrial scale and then it creates the sustainable recycling industry.

中文翻译：

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与商用多元醇相比，从消费后的聚对苯二甲酸乙二醇酯瓶中回收的双（2-羟乙基）对苯二甲酸酯在制备高性能聚氨酯方面的进展

摘要 通过综合表征评估了 rPUf（从消费后的聚（对苯二甲酸乙二醇酯）-PET 瓶中回收的对苯二甲酸双（2-羟乙基）酯 (BHET) 衍生的聚氨酯泡沫）和 cPUf（基于商业多元醇的聚氨酯泡沫）的行为，并比较了它们的热稳定性、可燃性和物理性能。在不使用阻燃剂的情况下，rPUf 通过了 UL-94HB 标准，而 cPUf 迅速燃烧到固定夹。rPUf 和 cPUf 的各种配方与既定的环保阻燃剂 (FR)，包括磷酸三苯酯、二乙基次膦酸铝和氢氧化铝，表现出显着更高的耐火性。实验和计算密度之间的差异表明了发泡过程的有效性。较大的差异表明FR对发泡过程的改进更大。正如吸附等温线实验所证明的那样，BHET 结构包含一个芳香族部分，可显着增强抗压强度并保护 rPUf/FRs 免于生物降解。因此，rPUf/FRs 可用作建筑材料，尤其是在高湿度条件下。这些是 BHET 相对于用于 PUf 制备的商业多元醇的优势。消费后 PET 瓶的化学回收以生产高性能 PUf 可以在工业规模上应用，然后创建可持续的回收行业。因此，rPUf/FRs 可用作建筑材料，尤其是在高湿度条件下。这些是 BHET 相对于用于 PUf 制备的商业多元醇的优势。消费后 PET 瓶的化学回收以生产高性能 PUf 可以在工业规模上应用，然后创建可持续的回收行业。因此，rPUf/FRs 可用作建筑材料，尤其是在高湿度条件下。这些是 BHET 相对于用于 PUf 制备的商业多元醇的优势。消费后 PET 瓶的化学回收以生产高性能 PUf 可以在工业规模上应用，然后创建可持续的回收行业。