Cysteamine functionalised reduced graphene oxide modification of maleated poly(propylene)
Cysteamine functionalised reduced graphene oxide modification of maleated poly(propylene)
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DOI：
10.1016/j.polymer.2020.122750
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发表时间：
2020-08-26
期刊：
影响因子：
4.6
通讯作者：
McNally, Tony
中科院分区：
文献类型：
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作者：
Abbas, Syeda S.;Kelly, Nicole L.;McNally, Tony
氧化石墨烯(GO)被还原(RGO)，然后通过硫醇-烯点击化学反应与端氨基的硫醇分子(半胱胺)官能化，生成还原的氧化石墨烯-半胱胺(rGO-cyst)。X-射线光电子能谱中C-S键的存在证实了半胱胺中的硫醇与rGO表面的双键以及还原形成的吡唑结构之间的反应。RGO-半胱胺与PP-g-MA反应生成PP-g-MA-rGO-半胱胺，其中rGO-半胱胺上的游离氨基与PP-g-MA的顺丁烯二酸酐反应。固体C-13魔角旋转、核磁共振(MAS)、傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)的研究证实了这一点，证明了以酰胺、亚胺和亚胺为基础的开环和闭环结构的混合物。电子显微镜成像观察到PP链在rGO表面的生长。半胱胺在rGO和PP-g-MA之间起着交联剂的作用，增加了两相之间的界面相互作用，从而提高了热稳定性，并改变了马来化PP的结晶行为。所描述的方法可用于使氧化石墨烯和一系列聚合物相容，以生产功能复合材料。
Graphene oxide (GO) was reduced (rGO) and then functionalised with an amino terminated thiol molecule (cysteamine) via a thiol-ene click chemistry reaction to produce reduced graphene oxide-cysteamine (rGO-cyst). The presence of the C-S bond in the X-ray photoelectron spectrum (XPS) confirmed the reaction between the thiol in cysteamine and both the double bonds present on the rGO surface and the pyrazolic structures formed due to reduction. The rGO-cysyteamine was reacted with polypropylene-graft-maleic anhydride (PP-g-MA) to produce PP-g-MA-rGO-cysteamine, where the free amino group present on the rGO-cysteamine reacts with the maleic anhydride group of PP-g-MA. This was confirmed from solid state C-13 Magic-Angle-Spinning, Nuclear Magnetic Resonance (MAS NMR), Fourier transform infrared (FTIR) and XPS studies which demonstrated that a mixture of open and closed ring structures based on amides, imides and imines were formed. Growth of the PP chain on the rGO surface was observed from electron microscopy imaging. Cysteamine acts like a 'cross-linker' between the rGO and PP-g-MA, increasing interfacial interaction between the two phases resulting in increased thermal stability and altering the crystallization behaviour of the maleated PP. The approach described could be used to compatabilise graphene oxide and a range of polymers to produce functional composite materials.