石墨烯/环氧树脂复合材料的制备及力学性能

Preparation and Mechanical Properties of Graphene/Epoxy Composites by In Situ Reduction of Graphene Oxide

分别通过超声共混法和原位还原法制备了石墨烯/环氧树脂复合材料。利用X射线光电子能谱(XPS)、X射线衍射(XRD)、光学显微镜和扫描电子显微镜(SEM)对复合材料的结构进行了表征,并对其力学性能进行了测试。结果表明,原位还原法制备的石墨烯/环氧树脂复合材料中,氧化石墨烯已经被成功地还原为石墨烯,并且石墨烯具有良好的分散性。力学性能测试结果表明,两种方法制备的复合材料的力学强度较纯环氧树脂明显提高。当石墨烯的量为m(GO)/m(EP)=0.3/100时,超声混合法制备的石墨烯/环氧树脂复合材料的拉伸强度和弯曲强度分别最大提高约29.2%和1.4%;而原位还原法制备的石墨烯/环氧树脂复合材料的拉伸强度和弯曲强度分别最大提高约40.5%和9.4%。

Graphene （GO）/epoxy composites were prepared by sonicate-mixing method and in situ reducing graphene oxide in the presence of the epoxy matrix. The structures of the as-prepared composites were characterized by X-ray photoelectron spectroscopy （XPS）, XRD, optical microscopy and SEM. In addition, the mechanical properties of the composites were also investigated using mechanical testing machine. XPS results indicate that graphene oxide has been reduced to GO in epoxy matrix. X-ray diffraction patterns, optical microscopy and scanning electron microscope images indicate that that graphene are well-dispersed in the epoxy matrix. Compared to pristine epoxy, the tensile strength and flexural strength of graphene/epoxy composites prepared by sonicate-mixing haethod increase by 29.2% and 1.4% respectively with the addition of 0.3% graphene. While the graphene/epoxy composites prepared by in situ reduction method show 40. 5% improvement in tensile strength and 9. 4% improvement in flexural strength with only 0.3 % of graphene.