工艺与制造英文2021被引 48
热可逆键和氧化石墨烯添加剂增强自修复环氧树脂/碳纤维层合板的弯曲和层间剪切强度
Thermoreversible Bonds and Graphene Oxide Additives Enhance the Flexural and Interlaminar Shear Strength of Self-Healing Epoxy/Carbon Fiber Laminates
Poulami Banerjee, Sachin Kumar, Suryasarathi Bose · Indian Institute of Science Bangalore
摘要整理
在当今高强度、轻质、耐久性航空器部件的发展需求下,碳纤维增强环氧树脂(CFRP)层合板因其高比强度、高比模量、低热膨胀系数和可调性能而备受青睐。然而,界面缺陷和分层导致的灾难性失效严重限制了服役寿命和经济效益。本研究重点评估了热可逆键和氧化石墨烯(GO)互连体的协同作用,以显著改善CFRP层合板的力学性能并赋予其自修复能力。采用真空辅助树脂传递模塑(VARTM)工艺制备了不同GO含量改性环氧树脂基体的层合板。碳纤维通过双马来酰亚胺(BMI)共价改性,在纤维-基体界面形成热可逆键与GO互连体。优化的GO改性环氧树脂层合板与BMI沉积碳纤维的弯曲强度和层间剪切强度(ILSS)分别提高了30%和47%。在60°C温度触发的自修复循环后,ILSS值恢复率达70%。这些性能改进对CFRP层合板构成的航空器机翼具有重要应用价值。
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