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首页> 外文期刊>Progress in Organic Coatings: An International Review Journal >Polyester-amide hyperbranched polymer as an interfacial modifier for graphene oxide nanosheets: Mechanistic approach in an epoxy nanocomposite coating
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Polyester-amide hyperbranched polymer as an interfacial modifier for graphene oxide nanosheets: Mechanistic approach in an epoxy nanocomposite coating

机译：聚酯 - 酰胺超支化聚合物作为石墨烯氧化物纳米片的界面改性剂：环氧纳米复合涂层中的机械方法

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摘要

Graphene Oxide nanosheets (GO) are synthesized through modified Hummer's method using expandable graphite. Consequently, the synthesized GO is surface functionalized by the aid of a polyester-amide hyperbranched polymer (HB) possessing hydroxyl end-groups. The characteristics of the surface modified GO are assessed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), UV-VIS spectroscopy and thermogravimetric analysis (TGA). The results show that HB molecules have been adsorbed on the GO surface and the dspacing of the GO lamellae has been increased from 11.058 angstrom to 13.763 angstrom. Subsequently, the modified GOs are impregnated into an epoxy resin at various loadings and dispersed utilizing mechanical agitation and complementary sonication process. The d-ispersions are mixed and cured with stoichiometric amount of a poly-amidoamine-based curing agent and applied on glass substrates to form 75-100 mu m thick free-standing films. Viscoelastic behavior are then evaluated by dynamic mechanical analysis (DMA). The results show that storage (E') modulus is enhanced and the glass transition temperatures (T-g) increases as GO and its modified counterparts are impregnated. Also, among the nanocomposites, coatings prepared by HB/GO = 0.5 and HB/GO = 1 show better improved properties indicating there exists an optimum ratio of GO/HB in which maximum surface modification has occurred.
机译：石墨烯氧化物纳米片（GO）通过可扩展石墨的改进的悍马方法合成。因此，通过具有羟基末端基团的聚酯 - 酰胺超义聚合物（HB）借助于聚酯 - 酰胺超支化聚合物（HB），合成的GO是官能化的。通过傅里叶变换红外光谱（FT-IR），X射线衍射（XRD），UV-Vis光谱和热重度分析（TGA）评估表面改性液的特性。结果表明，Hb分子已吸附在去表面上，并且Go Lamellae的Dspacing已从11.058埃埃斯特朗姆增加到13.763埃。随后，将改性的GOS在各种载荷处浸渍到环氧树脂中，并利用机械搅拌和互补超声处理分散。将D- ispersions混合并用化学计量的聚酰胺基固化剂固化，并在玻璃基板上施加以形成75-100μm厚的独立膜。然后通过动态机械分析（DMA）评估粘弹性行为。结果表明，增强了储存（E'）模量，玻璃化转变温度（T-G）随着去的增加，其改性对应物被浸渍。此外，在纳米复合材料中，通过Hb / Go = 0.5和Hb / Go = 1制备的涂层显示出更好的改进性质，表明存在最大的表面改性的Go / Hb的最佳比率。

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