Dual modification of graphene by polymeric flame retardant and Ni (OH)2 nanosheets for improving flame retardancy of polypropylene
Dual modification of graphene by polymeric flame retardant and Ni (OH)2 nanosheets for improving flame retardancy of polypropylene
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DOI：
10.1016/j.compositesa.2017.04.012
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发表时间：
2017-09-01
影响因子：
8.7
通讯作者：
Dai, Huaming
中科院分区：
文献类型：
--
作者：
Yuan, Bihe;Hu, Yuan;Dai, Huaming
为了提高氧化石墨烯的分散性和阻燃效率，采用高分子阻燃剂和具有催化碳化能力的纳米材料对氧化石墨烯进行双重改性。通过氧化石墨烯中的含氧官能团与六氯环三磷腈中的磷氯基团反应，将磷腈系阻燃剂接枝到氧化石墨烯上。由于Ni2+与该磷腈阻燃剂中的NH2基团的强亲和力，促进了Ni（OH）（2）纳米片在石墨烯上的修饰。透射电子显微镜图像证实了石墨烯在聚丙烯（PP）基体中的良好分散和剥离状态。功能化氧化石墨烯（FGO）的引入降低了PP燃烧过程中的峰值放热速率、总放热量和烟气释放量。根据热分解和残炭分析结果，对FGO的燃烧机理进行了探讨。该研究为提高石墨烯的分散性和阻燃效率提供了一种新的改性策略。(C)2017由Elsevier Ltd.出版
To improve its dispersion and flame retardant efficiency, graphene oxide (GO) is dually modified with polymeric flame retardant and the nanomaterial with catalytic carbonation ability. Via the reactions between oxygen functional groups in GO and P Cl groups in hexachlorocyclotriphosphazene, phosphazene-based flame retardant is grafted to GO. Due to the strong affinity of Ni2+ with NH2 groups in this phosphazene flame retardant, the decoration of Ni(OH)(2) nanosheets on the graphene is facilitated. Transmission electron microscopy images confirm good dispersion and exfoliation state of graphene in polypropylene (PP) matrix. The incorporation of functionalized graphene oxide (FGO) results in the reduction of peak heat release rate, total heat release and smoke release of PP during the combustion. Flame mechanism of FGO is concluded according to the results of thermal decomposition and char analysis. This work provides a novel modification strategy for enhancing the dispersion and flame retardant efficiency of graphene. (C) 2017 Published by Elsevier Ltd.