氧化石墨烯增强环氧树脂复合材料的制备及其力学性能研究

Preparation and mechanical properties of graphene oxide reinforced epoxy composites

以天然石墨为原料,利用改进的Hummers法制备氧化石墨烯,并对其进行X-射线衍射(XRD)和傅里叶变换红外光谱(FT-IR)表征。之后利用一种新型的有机溶剂三缩水甘油基对氨基苯酚(TGPAP)作为相转移剂和表面活性剂,将氧化石墨烯(GO)从水溶液转移到环氧树脂基体中,去除水分,加入固化剂进而得到混合液,最后利用浇铸法得到复合材料。通过万能测试拉力机对复合材料的拉伸性能和弯曲性能进行测试,结果表明氧化石墨烯的加入能够有效增强复合材料的力学性能:在添加0. 1%(质量分数)的氧化石墨烯时,复合材料拉伸强度达到最大值77. 29 MPa,与不添加氧化石墨烯相比提高了26. 60%;在添加1. 0%的氧化石墨烯时,拉伸模量达到最大值2 451. 99 MPa,与纯环氧树脂相比提高了21. 69%。

Graphene oxide has been prepared from natural graphite by the well-known Hummers＇ method with some modifications and the GO was characterized by XRD and FT-IR. Triglycidyl para-aminophenol（TGPAP） was used to facilitate direct and rapid transfer of the GO dispersion from water to an epoxy resin. The TGPAP acted not only as a phase transfer agent but also as an efficient surface modifier. Removal of the water from the epoxy resin and additon of hardener to the mixture afforded composite materials by a casting method. The tensile and flexural properties of the composites were measured with a universal tensile testing machine. The result showed that the mechanical properties were enhanced after the addition of graphene oxide. When the concentration of GO in the epoxy matrix was 0. 1 wt. %,the tensile strength reached its maximum value of 77. 29 MPa,which is 26. 60% higher than that without GO,and the tensile modulus reached a maximum of 2 451. 99 MPa at a GO concentration of 1. 0 wt. %,which is 21. 69% higher than the corresponding value for the pure sample.