超支化磷腈衍生物修饰GO及其环氧复合材料的力学性能研究

GO Modified by Hyperbranched Phosphonitrile Derivatives and the Mechanical Properties of Its Epoxy Composites

以γ-氨丙基三乙氧基硅烷(APTS)为偶联剂、六氯环三磷腈(HCTP)和己二胺(HMD)为支链,通过连续接枝法在氧化石墨烯(GO)表面引入端氨基超支化磷腈大分子(GO-HPC)。经FTIR、XPS、XRD、拉曼光谱Raman、SEM、TEM等测试证实端氨基超支化磷腈大分子已成功接枝在GO表面。将0.1%(质量分数)GO-HPC添加到环氧树脂(EP)中,研究复合材料中GO和GO-HPC的分散性和力学性能。结果表明,超支化磷腈衍生物增大了GO的层间距,提高了GO在树脂中的分散性;且其超支化结构和端氨基增强了GO与树脂基体间的机械啮合和化学键合作用,提高了二者间的界面结合性,最终使GO-HPC/环氧复合材料的拉伸强度、弹性模量、弯曲强度和弯曲模量显著提高,分别提高了65.37%、41.92%、49.60%和26.40%。

γ-aminopropyltriethoxysilane(APTS)as coupling agent,hexachlorocyclotriphosphonitrile(HCTP)and hexylenediamine(HMD)as branched chains,amino-terminal hyperbranched phosphonitrile(GO-HPC)was introduced on the grapheneoxide(GO)sheets surface by continuous grafting method.Through FTIR,XPS,XRD,Raman,SEM and TEM,it is confirmed that the amino-terminal hyperbranched phosphonitrile has been successfully grafted onto the GO sheets surface.Epoxy composites containing GO and GO-HPC with 0.1%(mass fraction)loadings were prepared and the dispersion and mechanical properties were systemically investigated.It is indicated that the hyperbranched phosphonitrile derivatives increased the spacing between GO layers,and improved the dispersion of GO in composites;its hyperbranched structure and terminal amino groups improved the mechanical interlocking and chemical bonding between GO and the resin matrix,and improved the interface bonding of composites,with the tensile strength,elastic modulus,flexural strength and modulus of GO-HPC/epoxy composite increasing by 65.37%,41.92%,49.60%and 26.40%,respectively.