氨基化石墨烯-玻璃纤维增强环氧复合材料的界面黏合性研究

Study on interfacial adhesion of amino-functionalized graphene-glass fiber reinforced epoxy composites

为提升玻璃纤维增强环氧复合材料(GFRE)的界面黏合性,本文先将脂肪二胺共价键合于氧化石墨烯表面得到氨基化石墨烯,再将其负载于玻璃纤维得到氨基化石墨烯-玻璃纤维预制体;最后通过真空辅助树脂灌注工艺制备氨基化石墨烯-玻璃纤维增强环氧复合材料。结果表明:适当烷基链长的脂肪二胺改性氧化石墨烯有助于提升复合材料的界面黏合性,而过长烷基链削弱了复合材料的界面黏合强度;相比于纯GFRE,经辛二胺改性氧化石墨烯所得复合材料的性能最佳,其中层间剪切强度提高了约35%,拉伸强度及模量分别提升了约37%和28%,弯曲强度及模量分别提升了约32%和43%;玻璃化转变温度提高了近9℃。

To enhance the interfacial adhesion of glass fiber reinforced epoxy composites(GFRE),amino-functionalized graphene was first obtained by grafting aliphatic diamines on the surface of graphene oxide(GO)via the covalent bond,and then deposited on the surface of glass fibers to obtain an amino-functionalized graphene-glass fiber preform.Finally,the amino-functionalized graphene-glass fiber reinforced epoxy composite was prepared based on the vacuum assisted resin injection molding process.The results show that the modification of GO by aliphatic diamine with appropriate alkyl chain lengths can contribute to improving the interfacial adhesion of the composites,while the long alkyl chain weakens the interfacial adhesion strength of the composites.Compared with pure GFRE,the mechanical and thermal properties of the composites containing diaminooctane-modified GO were the best.The interlaminar shear strength,tensile strength and modulus of such composite were promoted by about 35%,37%and 28%,respectively.And its flexural strength and modulus were improved by 32%and 43%,respectively.The glass transition temperature of such composite increased by nearly 9℃.