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首页> 外文期刊>Advanced Functional Materials >Polydopamine-Graphene Oxide Flame Retardant Nanocoatings Applied via an Aqueous Liquid Crystalline Scaffold
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Polydopamine-Graphene Oxide Flame Retardant Nanocoatings Applied via an Aqueous Liquid Crystalline Scaffold

机译：通过水性液晶支架施加的聚多巴胺-氧化石墨烯阻燃纳米涂料

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摘要

A highly effective flame retardant (FR) nanocoating was developed by conducting oxidative polymerization of dopamine monomer within an aqueous liquid crystalline (LC) graphene oxide (GO) scaffold coating. Due to its high water content, the LC scaffold coating approach facilitated fast transport and polymerization of dopamine precursors into polydopamine (PDA) within the water swollen interlayer galleries. Uniform and periodically stacked (14.5 angstrom d-spacing) PDA/GO nanocoatings could be universally applied on different surfaces, including macroporous flexible polyurethane (PU) foam and flat substrates such as silicon wafers. Remarkably, PDA/GO coated PU foam exhibited highly efficient flame retardant performance reflected by a 65% reduction in peak heat release rate at 5 wt% PDA/GO loading in an 80 nm thick coating. While many physically mixed flame retardants are usually detrimental to the mechanical properties of the foam, the PDA/GO coating did not affect mechanical properties substantially. In addition, the PDA/GO coatings were stable in water due to the intrinsic adhesion capability of PDA and the transformation of GO to the more hydrophobic reduced GO form. Given that PDA is produced from dopamine, a molecule prevalent in nature, these findings suggest that significant opportunities exist for new polymeric FRs derived from other natural catechols.
机译：通过在水性液晶（LC）氧化石墨烯（GO）支架涂层内进行多巴胺单体的氧化聚合反应，开发出一种高效的阻燃（FR）纳米涂层。由于其水含量高，LC支架涂层方法促进了水溶胀的中间层通道内多巴胺前体的快速运输和聚合成聚多巴胺（PDA）。均匀且定期堆叠（d间距为14.5埃/秒）的PDA / GO纳米涂层可以普遍应用于不同的表面，包括大孔柔性聚氨酯（PU）泡沫和诸如硅片的平坦基材。值得注意的是，涂有PDA / GO的PU泡沫材料显示出高效的阻燃性能，这反映在80 nm厚的涂层中，当PDA / GO负载量为5 wt％时，峰值放热率降低了65％。尽管许多物理混合的阻燃剂通常不利于泡沫的机械性能，但PDA / GO涂层并没有实质性地影响机械性能。此外，由于PDA的固有粘附能力以及GO转变为疏水性更强的还原GO形式，PDA / GO涂料在水中是稳定的。考虑到PDA是由多巴胺（一种自然界中普遍存在的分子）生产的，这些发现表明，存在衍生自其他天然邻苯二酚的新型聚合物FR的重大机会。

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  • 来源
    《Advanced Functional Materials》 |2018年第39期|1803172.1-1803172.9|共9页
  • 作者

    Kim Hanim; Kim Dae Woo; Vasagar Vivek; Ha Heonjoo; Nazarenko Sergei; Ellison Christopher J.;

  • 作者单位

    Univ Minnesota, Dept Chem Engn & Mat Sci, 421 Washington Ave SE, Minneapolis, MN 55455 USA;

    Univ Minnesota, Dept Chem Engn & Mat Sci, 421 Washington Ave SE, Minneapolis, MN 55455 USA;

    Univ Southern Mississippi, Sch Polymer Sci & Engn, 118 Coll Dr 5050, Hattiesburg, MS 39406 USA;

    Univ Minnesota, Dept Chem Engn & Mat Sci, 421 Washington Ave SE, Minneapolis, MN 55455 USA;

    Univ Southern Mississippi, Sch Polymer Sci & Engn, 118 Coll Dr 5050, Hattiesburg, MS 39406 USA;

    Univ Minnesota, Dept Chem Engn & Mat Sci, 421 Washington Ave SE, Minneapolis, MN 55455 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    flame retardants; graphene oxide; liquid crystal; nanocomposite; polydopamine;

    机译：阻燃剂;氧化石墨烯;液晶;纳米复合材料;聚多巴胺;

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