A kind of polyhedral oligomeric silsesquioxanes (POSS) containing the propoxyl‐epoxy and phenyl groups (pr‐ep‐Ph‐POSS) was synthesized via hydrolytic condensation reaction. Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy, and matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry identified the structure of the pr‐ep‐Ph‐POSS, including major caged Si₆O₉ (T6), Si₁₀O₁₅ (T10), Si₁₂O₁₈ (T12), etc. The pr‐ep‐Ph‐POSS was applied into the epoxy resin to achieve EP/pr‐ep‐Ph‐POSS composites. Thermogravimetric analysis indicated that EP/pr‐ep‐Ph‐POSS showed excellent thermal properties than pure EP. The fire behaviors of EP/pr‐ep‐Ph‐POSS composites were evaluated based on the cone calorimetry, limiting oxygen index (LOI), UL‐94 vertical burning test, and smoke density test. The smoke density decreased by ~30%, the LOI value reached to 26.4%, dripping was inhibited, and the peak of heat release rate decreased by ~62%. X‐ray photoelectron spectroscopy analysis and FTIR indicated that protective‐barrier effect is the main flame‐retardant mode of action for pr‐ep‐Ph‐POSS, due to the formation of the Si‐O‐Si, Si‐O‐C, and Si‐C condensed phase, which improve the thermal stability, strength, and integrity of the char layer.

中文翻译：

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含环氧多面体低聚倍半硅氧烷的阻燃环氧复合材料

通过水解缩合反应合成了一种含有丙氧基-环氧和苯基基团的多面体低聚倍半硅氧烷（POSS）。傅立叶变换红外光谱（FTIR），核磁共振光谱和基质辅助激光解吸/电离飞行时间质谱仪确定了pr-ep-Ph-POSS的结构，包括主要的笼状Si ₆ O ₉（T6 ），Si ₁₀ O ₁₅（T10），Si ₁₂ O ₁₈（T12）等。将pr-ep-Ph-POSS应用于环氧树脂中，以获得EP / pr-ep-Ph-POSS复合材料。热重分析表明，EP / pr-ep-Ph-POSS具有比纯EP优异的热性能。根据锥形量热法，极限氧指数（LOI），UL-94垂直燃烧测试和烟密度测试评估了EP / pr-ep-Ph-POSS复合材料的防火性能。烟气密度降低了约30％，LOI值达到了26.4％，滴落得到了抑制，放热率的峰值降低了约62％。X射线光电子能谱分析和FTIR表明，由于Si-O-Si，Si-O-C的形成，保护性屏障作用是pr-ep-Ph-POSS的主要阻燃作用方式。和Si-C冷凝相，可改善炭层的热稳定性，强度和完整性。