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首页> 外文期刊>RSC Advances >Covalently functionalized graphene oxide wrapped by silicon-nitrogen-containing molecules: preparation and simultaneous enhancement of the thermal stability, flame retardancy and mechanical properties of epoxy resin nanocomposites
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Covalently functionalized graphene oxide wrapped by silicon-nitrogen-containing molecules: preparation and simultaneous enhancement of the thermal stability, flame retardancy and mechanical properties of epoxy resin nanocomposites

机译：通过含硅氮分子包裹的共价官能化的石墨烯：制备和同时增强热稳定性，阻燃性和机械性能的环氧树脂纳米复合材料

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摘要

A novel functionalized graphene oxide (FGO) wrapped with Si-N-containing flame retardant (FR-fGO) was successfully synthesized via a chemical modification process and applied to enhance the thermal stability, fire resistance, and mechanical properties of epoxy resin (EP). Herein, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy were used to explore the structure and morphology of FR-fGO to overcome the fact that the FGO cannot strongly bond with the polymer matrix. With the incorporation of FR-fGO into EP, the thermal stability improved and the total heat release decreased compared with pure EP. Meanwhile, FR-fGO composites significantly reduced the amount of flammable and toxic volatiles. A possible flame-retardant mechanism of FR-fGO was deduced from a theoretical analysis of the chemical bond energy and the experimental results of thermal decomposition: namely, well-dispersed FR-fGO nanosheets constituted a physical barrier, with an Si-N-containing synergy system forming a highly graphitized residual char with an Si-containing cross-linked network. The enhancement in mechanical properties demonstrated that the composites had remarkable compatibility. This study provides a novel modification strategy to improve the dispersion and flame retardance of graphene.
机译：通过化学改性工艺成功地合成了用Si-N含量阻燃剂（FR-FGO）包裹的新型官能化的石墨烯氧化物（FPO），并施加以提高环氧树脂（EP）的热稳定性，耐火性和机械性能。这里，使用傅里叶变换红外光谱，X射线衍射，扫描电子显微镜和透射电子显微镜探讨FR-FGO的结构和形貌，以克服FGO不能与聚合物基质强烈结合的事实。随着FR-FGO进入EP，与纯EP相比，热稳定性改善和总热释放减少。同时，FR-FGO复合材料显着降低了易燃和有毒挥发物的量。从化学粘合能量的理论分析和热分解的实验结果中推断出FR-FGO的可能阻燃机制：即，分散的FR-FPN纳米片构成物理屏障，含Si-N协同效应系统，形成具有含Si的交联网络的高图形化残余炭。机械性能的增强证明复合材料具有显着的相容性。本研究提供了一种新的修饰策略，以改善石墨烯的分散和阻燃性。

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  • 来源
    《RSC Advances》 |2020年第24期|共11页
  • 作者

    Sui Yanlong; Qu Lijie; Li Peihong; Dai Xueyan; Fang Qiangsheng; Zhang Chunling; Wang Ying;

  • 作者单位

    Jilin Univ Sch Mat Sci &

    Engn Changchun 130025 Peoples R China;

    Jilin Univ Sch Mat Sci &

    Engn Changchun 130025 Peoples R China;

    Jilin Univ Sch Mat Sci &

    Engn Changchun 130025 Peoples R China;

    Jilin Univ Sch Mat Sci &

    Engn Changchun 130025 Peoples R China;

    Jilin Univ Sch Mat Sci &

    Engn Changchun 130025 Peoples R China;

    Jilin Univ Sch Mat Sci &

    Engn Changchun 130025 Peoples R China;

    Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Rare Earth Resource Utilizat Changchun 130022 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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