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Flame retardancy of epoxy resin nanocomposite with a novel polymeric nanoflame retardant

机译：环氧树脂纳米复合材料与新型聚合物纳米抑制剂的阻燃性

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摘要

A wrapped nanoflame retardant, designated as polyhedral oligomeric silsesquioxane (POSS)-poly(4-bromostyrene) (PBS)-carbon nanotubes (CNTs), was synthesized via pi-pi stacking interactions between the walls of multiwalled carbon nanotubes and the silicon-bromine containing hybrid copolymer (designated as POSS-PBS) that was copolymerized by 4-bromostyrene and acryloyloxyisobutyl polyhedral oligomeric silsesquioxane. The POSS-PBS-CNTs exhibited good dispersibility in epoxy resin (EP) without obvious aggregation. Furthermore, the fire behaviors of this flame-retardant EP (FR-EP) nanocomposites were examined via limited oxygen index (LOI) and cone calorimeter (CONE) tests. The FR-EP had an ideal LOI value of 35.3% and its residual char yield obtained from CONE test was significantly enhanced from 5.9% to 15.3% with the incorporation of 4 wt% POSS-PBS-CNTs and 1.33 wt% Sb2O3 into EP matrix. Additionally, the addition of 4 wt% POSS-PBS-CNTs or POSS-PBS can efficiently decrease the peak heat release rate (PHRR) of EP matrix by 41.0% or 45.6%, respectively.
机译：通过多壁碳纳米管和硅 - 溴之间的壁之间的PI-PI堆叠相互作用，合成了作为多面体低聚体次粒子烷（POSS）-Poly（4-溴苯乙烯）（PBS）（CNT）的包裹纳米α延迟剂（POSS） - 聚烯烃纳米管（CNT）合成。含有通过4-溴苯乙烯和丙烯酰氧基异丁酰基多烷烃喹甲酸酯共聚的杂种共聚物（指定为POSS-PBS）。 POSS-PBS-CNT在环氧树脂（EP）中表现出良好的分散性，而无明显聚集。此外，通过有限的氧指数（LOI）和锥形量热计（锥形）测试检查该阻燃EP（FR-EP）纳米复合材料的火灾行为。 FR-EP的理想LOI值为35.3％，其从锥形试验中获得的残留炭产率从5.9％掺入0.9％至15.3％，并将1.33wt％SB2O3掺入EP矩阵中。另外，加入4wt％POSS-PBS-CNT或POSS-PBS可以分别有效地将EP基质的峰值热释放率（PHRR）降低41.0％或45.6％。

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