Abstract In this research, polyurethane (PU)/tetraethyl orthosilicate (TEOS) composite was prepared via one-step polymerization method using different concentrations of TEOS in PU. The structural, optical and physical properties of PU composite were characterized by SEM imaging, FT-IR spectroscopy, water uptake, Raman spectroscopy and optical microscopy imaging of synthesized samples. The SEM results showed that by adding TEOS to the PU, the cell and window size of synthesized samples decreased. This result was also observed in the optical micrographs. The bonding characteristics of PU/TEOS composites were analyzed using Raman and FT-IR spectra. According to the FT-IR spectra, the degree of phase separation (DPS) and hydrogen bonding index, R, in 800 μl TEOS/PU had the highest R and DPS factors. By adding different concentrations of TEOS to PU, the apparent density decreased but the real density increased. The total, open and closed porosity of the synthesized samples were calculated. At low loading of TEOS in PU, the open porosity of the samples increased. The PU/TEOS composites may be promising candidates for absorbing sound.

中文翻译：

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金属醇盐掺杂聚氨酯复合材料的结构、光学和物理性能评价

摘要 本研究以聚氨酯中不同浓度的TEOS为原料，通过一步聚合法制备聚氨酯(PU)/原硅酸四乙酯(TEOS)复合材料。通过SEM成像、FT-IR光谱、吸水率、拉曼光谱和合成样品的光学显微镜成像对PU复合材料的结构、光学和物理性质进行了表征。SEM 结果表明，通过将 TEOS 添加到 PU 中，合成样品的单元和窗口尺寸减小。在光学显微照片中也观察到了这一结果。使用拉曼光谱和 FT-IR 光谱分析了 PU/TEOS 复合材料的粘合特性。根据 FT-IR 光谱，800 μl TEOS/PU 中的相分离度 (DPS) 和氢键指数 R 具有最高的 R 和 DPS 因子。通过在 PU 中加入不同浓度的 TEOS，表观密度降低但实密度增加。计算合成样品的总孔隙率、开放孔隙率和闭合孔隙率。在 PU 中 TEOS 的负载量较低时，样品的开孔率增加。PU/TEOS 复合材料可能是吸音的有前途的候选材料。