基于两种自主研制的环氧树脂胶液HTS40和HTS45分别加入了0.05%氧化石墨烯进行改性,制备了相应的T700级碳纤维增强复合材料,研究了4种环氧树脂胶液与碳纤维的浸润性、复合材料力学性能及其断面微观形貌和界面层厚度等方面。结果表明:HTS40和HTS45中分别加入0.05%氧化石墨烯改性后,树脂对碳纤维的浸润接触角分别同比降低了15.7%和18.4%,最终树脂吸附量分别同比增大了142.8%和60.9%,复合材料层间剪切强度、横向拉伸强度和纵向弯曲强度分别同比提高了18.8%和5.6%、19.4%和14.8%、15.8%和6.9%。复合材料断面扫描电镜(SEM)结果表明,氧化石墨烯改性后,断面中几乎观察不到碳纤维拔出现象,碳纤维与基体之间的间隙明显减少,断面原子力显微镜(AFM)测得平均界面层厚度分别同比增大了56.6%和53.3%。环氧树脂基体中加入微量氧化石墨烯,通过改善树脂对纤维的浸润性和提高最终复合材料界面层的厚度,可以显著提高复合材料综合力学性能。
Two self-developed epoxy resin gels,HTS40 and HTS45,were modified with 0.05wt% graphene oxide to prepare corresponding T700-grade carbon fiber reinforced composites.The wettability of four epoxy resin gels with carbon fibers,the mechanical properties,cross-sectional microstructure,and interface layer thickness of the composites were characterized and analyzed.The research results showed that after adding 0.05wt% graphene oxide to HTS40 and HTS45,the contact angles of the two resins with carbon fibers decreased by 15.7% and 18.4%,respectively,the final resin adsorption capacities decreased by 15.7% and 18.4%,respectively.The interlaminar shear strengths of the composites increased by 18.8% and 5.6%,respectively.The transverse tensile strengths increased by 19.4% and 14.8%,and the longitudinal bending strength increased by 15.8% and 6.9%,respectively.The SEM characterization results of the composite material section showed that almost no carbon fiber pull-out phenomenon was observed in the composite section,and the gap between the carbon fiber and the matrix was significantly reduced.The average interfacial layer thickness measured by AFM of the section increased by 56.6% and 53.3%,respectively.Adding trace amounts of graphene oxide to the epoxy resin matrix could significantly improve the comprehensive mechanical properties of the composite materials by improving the resin's fiber infiltration and increasing the thickness of the final composite interface layer.
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