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Effect of surfactant molecular structure on the electrical and thermal performance of epoxy/functionalized-graphene nanocomposites
Polymer Composites ( IF 5.2 ) Pub Date : 2020-03-19 , DOI: 10.1002/pc.25573
Orestis Vryonis 1 , Thomas Andritsch 1 , Alun S. Vaughan 1 , Paul L. Lewin 1
Affiliation  

In this study, three different moieties containing amino‐groups were incorporated into graphene oxide (GO) in order to modify interfacial interactions within an epoxy matrix. The GO was functionalized with two bifunctional molecules of different molar masses (d230 and d4000) and a trifunctional (t440). The resulting functionalized GO (fGO) systems were characterized by Raman spectroscopy, thermogravimetric analysis (TGA) and X‐ray photoelectron spectroscopy (XPS), which demonstrated the presence of the functionalizer groups. Analysis of nanocomposites including the above three fGOs by microscopy and differential scanning calorimetry (DSC) demonstrated that the presence of the functionalizer moieties served to improve the platelet distribution within the matrix and to affect the local fGO/matrix interfacial interactions perturbing the epoxy curing reactions; we suggest that these changes stem from the fGO surface structure and the introduction of additional reactive amine nitrogen. X‐ray diffraction revealed reduced graphitic stacking with increased functionalizer molar mass. The electrical conductivity of the fGO‐filled epoxy was enhanced with increasing functionalizer molecular weight, an effect we relate to the influence of this on platelet stacking. The thermal conductivity was, however, adversely affected by all reagents at low fGO contents.

中文翻译:

表面活性剂分子结构对环氧/功能化石墨烯纳米复合材料电热性能的影响

在这项研究中,将三种不同的含有氨基的部分结合到氧化石墨烯 (GO) 中,以改变环氧树脂基质内的界面相互作用。GO 被两个不同摩尔质量的双功能分子(d230 和 d4000)和一个三功能分子(t440)官能化。通过拉曼光谱、热重分析 (TGA) 和 X 射线光电子能谱 (XPS) 对所得官能化 GO (fGO) 系统进行表征,这证明了官能团的存在。通过显微镜和差示扫描量热法 (DSC) 对包含上述三种 fGO 的纳米复合材料的分析表明,功能化剂部分的存在有助于改善基质内的血小板分布并影响局部 fGO/基质界面相互作用,从而扰乱环氧树脂固化反应;我们认为这些变化源于 fGO 表面结构和额外活性胺氮的引入。X 射线衍射表明,随着官能剂摩尔质量的增加,石墨堆积减少。fGO 填充环氧树脂的导电性随着官能剂分子量的增加而增强,我们将这种影响与这对血小板堆积的影响联系起来。然而,在低 fGO 含量下,所有试剂都会对热导率产生不利影响。我们认为这些变化源于 fGO 表面结构和额外活性胺氮的引入。X 射线衍射表明,随着官能剂摩尔质量的增加,石墨堆积减少。fGO 填充环氧树脂的导电性随着官能剂分子量的增加而增强,我们将这种影响与这对血小板堆积的影响联系起来。然而,在低 fGO 含量下,所有试剂都会对热导率产生不利影响。我们认为这些变化源于 fGO 表面结构和额外活性胺氮的引入。X 射线衍射表明,随着官能剂摩尔质量的增加,石墨堆积减少。fGO 填充环氧树脂的导电性随着官能剂分子量的增加而增强,我们将这种影响与这对血小板堆积的影响联系起来。然而,在低 fGO 含量下,所有试剂都会对热导率产生不利影响。我们与此对血小板堆积的影响有关的影响。然而,在低 fGO 含量下,所有试剂都会对热导率产生不利影响。我们与此对血小板堆积的影响有关的影响。然而,在低 fGO 含量下,所有试剂都会对热导率产生不利影响。
更新日期:2020-03-19
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