共价接枝改性对石墨烯分散性能的影响
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摘要
本文将聚乙二醇单甲醚(PEO)氨基化处理得到氨基化PEO(PEO-NH2),然后利用PEO-NH2与氧化石墨烯(GO)表面的环氧基团反应,将PEO-NH2接枝到石墨烯表面上。对产物进行红外及热重分析表征结果表明,PEO-NH2成功地接枝到了GO、还原氧化石墨烯(rGO)表面,接枝PEO-NH2的含量分别约为34.4wt%、20.5wt%。此外,经水合肼还原后的PEO-rGO在水溶液和N,N-二甲基甲酰胺(DMF)中仍具有较好的分散性。
Amine-terminal functionalized PEO(PEO-NH2)was synthesized via the amino-treatment of polyethylene glycol monomethyl ether(PEO).The PEO-NH2 was then grafted onto the surface of the graphene through ring-opening reaction between amino groups of PEO and epoxy groups of graphene.Characterization of the products proved that PEO-NH2 was successfully grafted onto the surface of graphene.The grafting ratios determined from TGA analysis for the resulting PEO-GO and PEG-rGO are about 34.4 wt% and 20.5 wt%,respectively.In addition,the reduced PEO-rGO maintains a good dispersion state in aqueous solution and N,N-dimethylformamide(DMF)solvent.
Amine-terminal functionalized PEO(PEO-NH2)was synthesized via the amino-treatment of polyethylene glycol monomethyl ether(PEO).The PEO-NH2 was then grafted onto the surface of the graphene through ring-opening reaction between amino groups of PEO and epoxy groups of graphene.Characterization of the products proved that PEO-NH2 was successfully grafted onto the surface of graphene.The grafting ratios determined from TGA analysis for the resulting PEO-GO and PEG-rGO are about 34.4 wt% and 20.5 wt%,respectively.In addition,the reduced PEO-rGO maintains a good dispersion state in aqueous solution and N,N-dimethylformamide(DMF)solvent.
引文
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[3]Nethravathi C,Rajamathi M.Chemical Modified Grapheme Sheets Produced by the Solvothermal Reduction of Colloidal Dispersions of Graphite Oxide[J].Carbon,2008,46(14):1994~1998.
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[5]Salavagione H J,Gomez M A,Martnez G.Polymeric Modification of Graphene Through Esterification of Graphite Oxide and Poly(Vinyl Alcohol)[J].Macromolecules,2009,42:6331~6334.
[6]Tong W S,Zhang Y H,et al.Achieving Significantly Enhanced Dielectric Performance of Reduced Graphene Oxide/Polymer Composite by Covalent Modification of Graphene Oxide Surface[J].Carbon,2015,94:590~598.
[7]Sung H R,Sin J H,Shanmugharaj A M.Study on the Effect of Hexamethylene Diamine Functionalized Graphene Oxide on the Curing Kinetics of Epoxy Nanocomposites[J].European Polymer Journal,2014,52:88~97.
[8]Park Y J,Park S Y,et al.Preparation of Water Soluble Graphene Using Polyethylene Glycol:Comparison of Covalent Approach and Noncovalent Approach[J].Journal of Industrial and Engineering Chemistry,2011,17:298~303.
[9]Hummers W S,Offeman R E.Preparation of Graphitic Oxide[J].Journal of the American Chemical Society,1958,80:1339.
[10]Wu Z S,Ren W C,Gao L B,et al.Synthesis of High-Quality Graphene with a Pre-determined Number of Layers[J].Carbon,2009,47:493~449.
[11]王孝杰,孙建平,李效东,等.氨基化单甲氧基聚乙二醇的合成研究[J].精细化工中间体,2006,36(1):40~42.
[12]Zhang S,Xiong P,Yang X,et al.Novel PEG Functionalized Graphene Nanosheets:Enhancement of Dispersibility and Thermal Stability[J].Nanoscale,2011,3(5):2169~2174.
[13]Li M,Huang X,Wu C,et al.Fabrication of Two-dimensional Hybrid Sheets by Decorating Insulating PANI on Reduced Graphene Oxide for Polymer Nanocomposites with Low Dielectric Loss and High Dielectric Constant[J].Journal of Materials Chemistry,2012,22(44):23477~23484.
[14]Kim H,Abdala A A,et al.Graphene/polymer Nanocomposites[J].Macromolecules,2010,43(16):6515~6530.
[15]张树鹏,宋海欧.高分散性氧化石墨烯基杂化体的制备及其热稳定性增强[J].新型炭材料,2013,28(1):61~65.
[16]Wan Y J,Yang W H,Yu S H,et al.Covalent Polymer functionalization of Graphene ForImproved Dielectric Properties and Thermal Stability of Epoxy composites[J].Composites Science and Technology,2016,122:27~35.
[17]马文石,周俊文,程顺喜.石墨烯的制备与表征[J].高校化学工程学报,2010,24(4):719~722.
[18]Cristina G N,Matteo S,Alexander M B,et al.Electronic Transport Properties of Individual Chemically Reduced Graphene Oxide Sheets[J].Nano Letters,2007,7(11):3499~3503.