A new polyhedral oligomeric silsesquioxane (POSS) derivate bearing phenylboronic acid group and 6H‐dibenzo[c,e][1,2]oxaphosphinine‐6‐oxide (DOPO) unit was synthesized and applied in flame retardant epoxy resin (EP). Compared to pure EP, EP/POSS‐DOPO‐(phenylboronic acid) composites had good transparency and better thermal stability. Micro‐scale combustion calorimetry results showed that the addition of POSS‐DOPO‐(phenylboronic acid) hybrid could greatly reduce the PHRR and THR of EP/POSS‐DOPO‐(phenylboronic acid) composite. Simultaneously, the UL‐94 of EP composite with 7% POSS‐DOPO‐(phenylboronic acid) achieved V‐0 grade and the LOI value increased from 19.4% (neat EP) to 28.6%. Raman spectra results suggested that POSS‐DOPO‐(phenylboronic acid) hybrid enhanced the formation of residual char with graphitic structure during combustion. Besides, SEM characterization showed that the char of EP/POSS‐DOPO‐(phenylboronic acid) composite was much more continuous and compact in comparison with that of control samples. Moreover, the mechanical and dielectric properties of EP/POSS‐DOPO‐(phenylboronic acid) composites have been greatly improved for a better application.

中文翻译：

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多面体低聚倍半硅氧烷与DOPO和苯硼酸混合制成阻燃环氧树脂

合成了一种新的带有苯硼酸基团和6H-二苯并[c，e] [1,2]氧膦膦-6-氧化物（DOPO）单元的多面体低聚倍半硅氧烷（POSS），并将其应用于阻燃环氧树脂（EP）中。与纯EP相比，EP / POSS-DOPO-（苯硼酸）复合材料具有良好的透明度和更好的热稳定性。微量燃烧量热法结果表明，添加POSS‐DOPO‐（苯基硼酸）杂化物可以大大降低EP / POSS‐DOPO‐（苯基硼酸）复合材料的PHRR和THR。同时，含7％POSS-DOPO-（苯基硼酸）的EP复合材料的UL-94达到V-0级，LOI值从19.4％（纯EP）提高到28.6％。拉曼光谱结果表明，POSS-DOPO-（苯基硼酸）杂化可增强燃烧过程中具有石墨结构的残余炭的形成。除了，SEM表征表明，与对照样品相比，EP / POSS-DOPO-（苯基硼酸）复合材料的炭连续性和致密性更高。此外，EP / POSS-DOPO-（苯基硼酸）复合材料的机械和介电性能也得到了很大改善，从而可以更好地应用。