Abstract Massive release of toxic volatiles and smoke during combustion is one of the biggest problems facing epoxy resin composites, therefore, it is still a huge challenge to obtain a flame retardant that can simultaneously improve the flame retardancy and reduce the evolution of smoke and toxic gases. Herein, a novel lithium containing polyhedral oligomeric phenyl silsesquioxane (Li-Ph-POSS) has been prepared via hydrolysis condensation of phenyltriethoxysilane in the presence of LiOH·H2O. FTIR, NMR, and MALDI-TOF-MS were used to identify the structure of Li-Ph-POSS, which indicate that it is a hepta-phenyl POSS comprised of incompletely condensed Si–OH and Si–O–Li groups. The excellent compatibility and dispersion of Li-Ph-POSS in EP/Li-Ph-POSS nanocomposites were detected by SEM and TEM. The effective smoke suppression and flame retardancy of EP/Li-Ph-POSS nanocomposites were investigated using cone calorimeter, smoke density and limited oxygen index measurements. Compared with pure EP, the EP with 4 wt% Li-Ph-POSS made the peak of heat release rate (p-HRR), total heat release (THR), peak of smoke production rate (p-SPR) and peak of CO production rate (p-COP) reduce by 61%, 36%, 44%, and 72%, respectively. This work provides a new strategy of mitigating the fire hazard of EP using phosphorus- and halogen-free metal-POSS.

中文翻译：

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含锂多面体低聚苯基倍半硅氧烷的简便合成及其优异的环氧树脂透明性、抑烟性和阻燃性

摘要 燃烧过程中有毒挥发物和烟雾的大量释放是环氧树脂复合材料面临的最大问题之一，因此，获得一种能够同时提高阻燃性并减少烟雾和有毒气体产生的阻燃剂仍然是一个巨大的挑战。 . 在此，通过苯基三乙氧基硅烷在 LiOH·H2O 存在下的水解缩合制备了一种新型含锂多面体低聚苯基倍半硅氧烷 (Li-Ph-POSS)。FTIR、NMR 和 MALDI-TOF-MS 用于鉴定 Li-Ph-POSS 的结构，表明它是由不完全缩合的 Si-OH 和 Si-O-Li 基团组成的七苯基 POSS。SEM 和 TEM 检测到 Li-Ph-POSS 在 EP/Li-Ph-POSS 纳米复合材料中的优异相容性和分散性。使用锥形量热仪、烟雾密度和有限氧指数测量研究了 EP/Li-Ph-POSS 纳米复合材料的有效抑烟和阻燃性。与纯EP相比，含4 wt% Li-Ph-POSS的EP使放热率峰值（p-HRR）、总放热率（THR）、产烟率峰值（p-SPR）和CO峰值出现生产率 (p-COP) 分别降低了 61%、36%、44% 和 72%。这项工作提供了一种使用无磷和无卤金属 POSS 减轻 EP 火灾危险的新策略。产烟率峰值 (p-SPR) 和 CO 产率峰值 (p-COP) 分别降低 61%、36%、44% 和 72%。这项工作提供了一种使用无磷和无卤金属 POSS 减轻 EP 火灾危险的新策略。产烟率峰值 (p-SPR) 和 CO 产率峰值 (p-COP) 分别降低 61%、36%、44% 和 72%。这项工作提供了一种使用无磷和无卤金属 POSS 减轻 EP 火灾危险的新策略。