The study investigates the high-performance saturated polyurethane (SPU) composites based on the reinforcement of polymeric filler bis 2-hydroxyethyl terephthalate (BHET), hydrophobic nano-silica (NS), and fire retarding additives. The BHET was synthesized from scraped polyethylene terephthalate (PET). The thermal and morphological study of prepared SPU composites was analyzed by thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The fillers were analyzed by energy dispersive spectroscopy (EDX). Fourier transform infrared spectroscopy (FT-IR) was utilized to investigate the molecular functionality of filled SPU. The TGA, UL-94, Limiting oxygen index, smoke density were used to determine the thermal properties of filled SPU-A, SPU-A1 composite with (1:1) ratio of filler NS-BHET (0.5%, 1%, 1.5%, 2%) and non-halogenated fire-retarding additives ammonium polyphosphate-melamine (0%, 1%, 2%, 3%). The filler loading, at 1% the tensile strength increased to 42%, and the effect of the composites ruptured surface was supported by SEM analysis. Water contact angle, water absorptivity, gel content, and chemical exposure tests revealed that fabricated composites with varying filler percentages showed superior hydrophobicity with water, moisture, and first-rate resistance to chemical entities. The incombustibility of the composite is imparted by an enhanced thermal degradation temperature of filled SPU due to the thermic stability of terephthalic and sebacic acid utilized in synthesis revealed by TGA. Smoke density decreased from 85% to 45% after the fire, and smoke suppressing additives were introduced at A1 (0–3%). As a result, the LOI increased from 19 to 24. Ultimately, the thermo-mechanical, chemical, moisture resistance, and non-combustibility of the SPU composite improved.

该研究调查了基于聚合物填料双 2-羟乙基对苯二甲酸酯 (BHET)、疏水纳米二氧化硅 (NS) 和阻燃添加剂增强的高性能饱和聚氨酯 (SPU) 复合材料。BHET 是由刮过的聚对苯二甲酸乙二醇酯 (PET) 合成的。通过热重分析 (TGA) 和扫描电子显微镜 (SEM) 分析了制备的 SPU 复合材料的热和形态研究。通过能量色散光谱(EDX)分析填料。傅里叶变换红外光谱 (FT-IR) 用于研究填充 SPU 的分子功能。用TGA、UL-94、极限氧指数、烟密度测定填充SPU-A、SPU-A1复合材料与（1:1）填料NS-BHET（0.5%、1%、1.5 %, 2%）和非卤化阻燃添加剂聚磷酸铵-三聚氰胺（0%、1%、2%、3%）。填充量在 1% 时，拉伸强度增加到 42%，SEM 分析支持复合材料破裂表面的影响。水接触角、吸水率、凝胶含量和化学暴露测试表明，具有不同填料百分比的复合材料显示出优异的疏水性，防水、防潮，对化学实体具有一流的抵抗力。由于 TGA 显示合成中使用的对苯二甲酸和癸二酸的热稳定性，填充 SPU 的热降解温度提高，从而赋予复合材料的不燃性。火灾发生后，烟雾密度从 85% 下降到 45%，并在 A1（0-3%）处引入了抑烟添加剂。其结果，