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首页> 外文期刊>RSC Advances >Preparation of novel phosphorus-nitrogen-silicone grafted graphene oxide and its synergistic effect on intumescent flame-retardant polypropylene composites
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Preparation of novel phosphorus-nitrogen-silicone grafted graphene oxide and its synergistic effect on intumescent flame-retardant polypropylene composites

机译：新型氮磷硅树脂接枝氧化石墨烯的制备及其对膨胀型阻燃聚丙烯复合材料的协同作用

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Due to the poor dispersion in polymer matrix, graphene can hardly be used alone as a flame-retardant additive for polymers. In this paper, a novel halogen-free flame retardant – the ternary graft product of silsesquioxane, graphene oxide and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (PMGO) with a structure of graphene oxide layers modified with the synergistic flame retardant multiple elements of phosphorous, nitrogen and silicon was synthesized and then used in combination with traditional intumescent flame retardant (IFR) to enhance the flame retardancy of polypropylene (PP). The experimental results show that the thermal and flame retardant properties of flame-retardant (FR) PP composites are significantly improved by introducing 5 wt% PMGO as well as 20 wt% IFR. The peak heat release rate and total heat release of the FR PP composite are reduced 61.5% and 40.2%, respectively, compared to neat PP. Based on the char layer observation and thermal analysis, the enhancement in flame retardancy is mainly attributed to the outstanding intumescent char layers with high strength and thermal stability formed under the synergistic effect of PMGO and IFR. Besides, the introduced phosphorous, nitrogen and silicon hydrophilic groups do not show the negative effects on the surface hydrophobicity of flame retardant PP materials, which could broaden its scope of application.
机译：由于在聚合物基质中的分散性差，因此石墨烯几乎不能单独用作聚合物的阻燃添加剂。在本文中，一种新型的无卤阻燃剂–倍半硅氧烷，氧化石墨烯和9,10-二氢-9-氧杂-10-磷酸苯菲十氧化物（PMGO）的三元接枝产物，其中氧化石墨烯层的结构得到了改性合成阻燃剂具有磷，氮和硅的多种元素，然后与传统的膨胀型阻燃剂（IFR）结合使用，以增强聚丙烯（PP）的阻燃性。实验结果表明，通过引入5 wt％的PMGO和20 wt％的IFR，阻燃（FR）PP复合材料的热和阻燃性能得到了显着改善。与纯聚丙烯相比，FR PP复合材料的峰值放热速率和总放热分别降低了61.5％和40.2％。基于炭层的观察和热分析，阻燃性的提高主要归因于在PMGO和IFR的协同作用下形成的具有高强度和热稳定性的出色膨胀型炭层。此外，引入的磷，氮和硅的亲水基团不会对阻燃PP材料的表面疏水性产生负面影响，从而可以扩大其应用范围。

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