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Effect of incorporation of POSS compounds and phosphorous hardeners on thermal and fire resistance of nanofilled aeronautic resins

机译：掺入足化合物和磷硬化剂对纳米甲型航空树脂热敏耐火性的影响

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The aim of this work is the identification of the best strategy for improving thermal, fire resistance and electrical conductivity of an epoxy resin for aeronautic applications. The effect of DodecaPhenyl POSS (DPHPOSS), Epoxycyclohexyl POSS (ECPOSS), Glycidyl POSS (GPOSS) and TriglycidylCyclohexyl POSS (TCPOSS) to act as flame retardants of the resin was evaluated. Flame retardancy tested by the limiting oxygen index (LOI) indicated that GPOSS has meaningful effects on the flame retardancy of the epoxy mixture. The incorporation of 5 wt% of GPOSS into the epoxy matrix resulted in a LOI value of 33 with respect to 27 of the pure epoxy mixture. The trend observed by LOI tests was confirmed by mass loss calorimetry measurements: a decrease from 540 kW m ~(?2) down to 327 kW m ~(?2) was observed in the peak of heat release rate (PHRR). LOI and PHRR values were compared with those obtained for the same resin replacing the 4,4′-diaminodiphenyl sulfone (DDS) with the bis(3-aminophenyl) phenylphosphineoxide (BAPPO) and the bis(3-aminophenyl) methyl phosphine oxide (BAMPO). BAMPO and BAPPO proved to be more effective than POSS compounds to increase LOI values. Carbon nanotubes (CNTs), embedded inside the epoxy resin to enhance electrical conductivity, are found to affect significantly fire properties of epoxy systems mainly by preventing the epoxy systems from forming intumescent charring.
机译：这项工作的目的是识别用于改善航空应用环氧树脂的热，耐火和电导率的最佳策略。评价十二烷基（DPHPOSS），环氧环己基足总（ECPOSE），缩水甘油基（GPOSS）和三丙啶基环己基足以用作树脂阻燃剂的作用的影响。通过限制氧指数（LOI）测试的阻燃性表明GPOS对环氧混合物的阻燃性具有有意义的影响。将5wt％的GPOS掺入环氧基质中，得到了相对于纯环氧混合物中的27的LOI值为33。通过质量损失量热测量测量证实了LOI测试观察的趋势：在热释放率（PHRR）的峰值中观察到从540kW m〜（Δ2）下降到327kW m〜（Δ2）的降低。将LOI和PHRR值与与双（3-氨基苯基）苯基膦酰胺（BAPPO）和双（3-氨基苯基）甲基氧化膦（Bampo ）。 Bampo和Bappo被证明比POSS化合物更有效，以增加LOI值。嵌入环氧树脂内部以增强导电性的碳纳米管（CNT），主要通过防止环氧树脂形成膨胀率来影响环氧系统的显着灭火性质。

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