摘要
通过环氧氨解反应,将聚醚胺(Huntsman Jeffamine M-2005)共价接枝到氧化石墨烯表面,同时实现氧化石墨烯的还原.通过红外光谱(IR)、X射线光电子能谱(XPS)、拉曼光谱、X射线衍射分析(XRD)、以及透射电镜(TEM)对聚醚胺接枝的还原石墨烯材料进行了表征.结果表明,聚醚胺不仅成功地接枝到了还原氧化石墨烯表面,而且还一定程度上还原了氧化石墨烯.进一步地,将聚醚胺接枝的还原氧化石墨烯添加到环氧树脂中,制备了功能化石墨烯/环氧树脂纳米复合物.热重分析(TGA)和极限氧指数(LOI)测试显示当聚醚胺接枝的还原石墨烯添加量为10 wt%时,复合物的残碳率(700℃)和LOI分别提高了137%和30%,表明聚醚胺接枝的还原石墨烯显著提高了环氧树脂的阻燃性能,是一种优良的具有潜在应用价值的阻燃剂.
Simultaneous reduction and surface functionalization of graphene oxide （GO） were realized by simple refluxing of GO with polyetheramine （ Huntsman Jeffamine M-2005, abbreviation ： JM-2005 ） without the addition of any reducing agents. The JM-2005-reduced GO sample （JM-2005-rGO） prepared via the epoxide aminolysis reaction in this work were characterized by FTIR spectroscopy, X-Ray photoelectron spectroscopy （ XPS）, X-ray diffraction analysis （XRD） and Raman spectroscopy. All of the above results confirmed that JM- 2005 not only covalently bonded to the GO, as a functionalization moiety,but also partly restored the conjugate structure of GO, as a reducing agent. Transmission electron microscopy （TEM） revealed that JM-2005-rGO sheets were slightly wrinkled and folded on the uhrathin carbon membrane. The well-defined diffraction spots of the selected area electron diffraction （SAED） pattern confirmed the crystalline structure of JM-2005-rGO. The evolution of surface functionality during reaction made the hydrophilic GO hydrophobic, as evidenced by the good dispersion of JM-2005-rGO in toluene solvent without noticeable precipitation. Furthermore,the various amounts of JM-2005-rGO were added to the epoxy resin,producing the JM-2005-rGO/epoxy nanocomposites. The flame retardancy and thermal stability of JM-2005-rGO/epoxy nanocomposites containing various weight fractions of JM-2005-rGO were investigated by the limiting oxygen index （LOI） test and thermogravimetric analysis （TGA） in nitrogen. Significant increases in the char yield and LOI were achieved with the addition of 10 wt% JM-2005-rGO in epoxy, giving improvements of 137 % and 30% , respectively. This report demonstrates a cost-effective approach to construct the functionalized graphene/epoxy nanocomposites, with reinforced properties and indicates further application in research and industrial areas.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2015年第11期1344-1352,共9页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51109127)
上海市教委一流学科建设项目(项目号A151021402S)
上海市研究生教育创新计划实施项目(项目号20131129)资助
关键词
石墨烯
聚醚胺
共价接枝
环氧树脂纳米复合物
阻燃
Graphene, Polyetheramine, Covalent graft, Epoxy nanocomposite, Flame-Retardant
