氧化石墨烯的尺寸对碳纤维/环氧树脂 湿热界面性能的影响. (Chinese)

Two different sizes of graphene oxide（GO） produced by the Hummers method had been incorporated into epoxy resins and used to fabricate GO modified carbon fiber reinforced epoxy resin composites（GO/CF/EP） by compression molding method, and the composite material was processed under damp and heat conditions. The modification effects of dry and wet composite materials were investigated through interlayer shear performance, dynamic thermomechanical properties and microscopic morphology. The results indicate that GO has a good improvement on the interlaminar shear strength and glass transition temperature of composite materials. In the dry state at room temperature, two sizes of GO have basically the same improvement effect on the interlaminar shear strength of the composite. With the increase of GO content, the small size of GO makes the hygrothermal interlaminar shear strength of composites decrease faster. When the GO content is 0.1%（mass fraction, the same as below）, the improvement of the interlaminar shear performance of the composite material is better, however, the glass transition temperature of the composite material is better when the GO content is 0.2%. With the increase of GO content, the exothermic peak of the GO-EP composite resin matrix shifts to low temperature, and the small size of GO shortens the gel time of the composite resin. The micro-morphology analysis shows the presence of GO is beneficial for increasing the crack propagation path during the failure of composite material, thereby more conducive to the dissipate the crack tip energy by the material. [ABSTRACT FROM AUTHOR]

通过 Hummers法获得两种尺寸的氧化石墨烯(GO),利用模压成型制备 GO 改性碳纤维增强环氧树脂复合材料 (GO/CF/EP),并对复合材料进行湿热处理,利用层间剪切性能、动态热机械性能和微观形貌分析室温干态和湿热处理 后复合材料的改性效果。结果表明:GO 对复合材料的层间剪切强度和玻璃化转变温度均具有良好的改善作用;室温干 态时两种尺寸 GO 对复合材料层间剪切强度的改善效果基本相同;随 GO 含量增加,小尺寸 GO 使复合材料的湿热层间 剪切强度下降更快,GO 含量为0.1%(质量分数,下同)时对复合材料的层间剪切性能改善作用较好,而 GO 含量为 0.2%时对复合材料的玻璃化转变温度改善更好。随 GO 含量增加,GO-EP复合树脂基体的放热峰向低温移动,小尺寸 GO使复合树脂的凝胶时间变短。微观形貌分析表明,GO 的存在有利于增加复合材料破坏时的裂纹扩散路径,从而更 有助于材料耗散裂纹尖端能量。 [ABSTRACT FROM AUTHOR]

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