Facile Synthesis of Alkali Metal Polyhedral Oligomeric Silsesquioxane Salt and Its Application in Flame-Retardant Epoxy Resins
Facile Synthesis of Alkali Metal Polyhedral Oligomeric Silsesquioxane Salt and Its Application in Flame-Retardant Epoxy Resins
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DOI：
10.1021/acsapm.3c00458
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发表时间：
2023-04
影响因子：
5
通讯作者：
Wenyuan Zhang;Zijian Zheng;Mingyuan Zhang;F. Yang;Wenchao Zhang;Xiaolu Wu;Rongjie Yang
中科院分区：
文献类型：
--
作者：
Wenyuan Zhang;Zijian Zheng;Mingyuan Zhang;F. Yang;Wenchao Zhang;Xiaolu Wu;Rongjie Yang
采用点击反应和中和反应合成了一系列笼型倍半硅氧烷金属盐（POSS-M，M = Li、Na或K）。通过FT-IR、1H、13 C、29 Si NMR和XRD表征了POSS-M的化学结构。将表征良好的POSS-M引入到环氧树脂中。含有POSS-Na的环氧复合材料达到了UL-94 V1等级，最高的LOI值也来自EP/POSS-Na，为27.4%。在所有三种复合物中观察到pHRR急剧下降。当POSS-M质量分数为3%时，复合材料的pHRR下降了64.2%。值得注意的是，第一次清楚地观察到在表面上具有硅酸钠的致密炭层，扩展了含硅阻燃机理。
A series of metal polyhedral oligomeric silsesquioxane salts (POSS-M, M = Li or Na or K) were facilely synthesized using the click reaction and neutralization reaction. The chemical structure of POSS-M was confirmed by FT-IR,1H,13C,29Si NMR, and XRD patterns. The well-characterized POSS-M was introduced into epoxy resins. The epoxy composites containing POSS-Na achieved the UL-94 V1 rating, and the highest LOI value also came from EP/POSS-Na, which was 27.4%. A dramatical decrease in pHRR was observed in all three composites. With 3 wt % POSS-M, the pHRR of epoxy composites dropped by up to 64.2%. Notably, compact char layers with sodium silicate on the surface were clearly observed for the first time, extending the silicon-containing flame retardant mechanism.