EPN纳米橡胶粒子增韧双氰胺环氧树脂及其复合材料性能研究  

Study on properties of dicyandiamide cured epoxy resin and its composite material toughened by EPN nano-rubber particle

作　　者：李亚锋 张杜鹃 鹿海军 Li Yafeng;Zhang Dujuan;Lu Haijun(Composite Technology Center,AVIC Manufacturing Technology Institute,Beijing 101300,China;National Key Laboratory of Science and Technology on Advanced Composites,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]中国航空制造技术研究院复合材料技术中心,北京101300 [2]中国航发北京航空材料研究院先进复合材料重点实验室,北京100095

出　　处：《中国胶粘剂》2022年第7期7-12,共6页China Adhesives

摘　　要：采用EPN核壳纳米橡胶粒子对双氰胺固化环氧树脂进行增韧改性。通过傅里叶变换红外光谱(FT-IR)法和扫描电子显微镜(SEM)法表征了EPN的化学结构和表面形貌;使用扫描透射电镜(TEM)表征了EPN粒子在环氧树脂中的分散状态;通过黏度、差示扫描量热分析(DSC)法以及动态热机械分析仪(DMA)表征了EPN粒子对体系流变性能、反应活性以及耐热性的影响;通过树脂浇铸体的冲击强度、复合材料的I型层间断裂韧性(G)与冲击后压缩强度(CAI)研究了EPN粒子对树脂及其复合材料韧性的影响。研究结果表明:EPN粒子表面含有大量活性官能团,与环氧树脂间具有良好的相容性,能够以纳米尺寸分散在环氧树脂中;EPN粒子表面的活性官能团能够与环氧树脂反应,添加EPN粒子体系的黏度能够满足材料工艺需求。EPN粒子对环氧树脂具有良好的增韧效果,6%左右的添加量即可使树脂基体的冲击强度达到51 kJ/m^(2)以上,较增韧前提高了130%,同时对体系的Tg无明显影响。复合材料韧性研究结果表明,添加EPN质量分数为6%的复合材料的G_(IC)和CAI均提高了60%以上,具有显著的增韧效果。A kind of EPN core-shell nano-rubber particle was selected to modify the toughness of dicyandiamide cured epoxy resin. The chemical structure and surface morphology of EPN were characterized by Fourier transform infrared spectroscopy(FT-IR)and scanning electron microscopy(SEM). The dispersion state of EPN particle in epoxy resin was characterized by transmission electron microscopy(TEM). The effects of EPN particle on the rheological properties,reactivity and heat resistance of the system were characterized by viscosity,differential scanning calorimetry(DSC) and dynamic thermomechanical analyzer(DMA). The effects of EPN particle on the toughness of resin and its composite material were studied by the impact strength of resin casting,model I interlaminar fracture toughness(GIC)and compression after impact(CAI). The research results showed that the surface of EPN particle contained a large number of active functional groups,which had good compatibility with epoxy resin,and could be dispersed in epoxy resin in nano size. The active functional groups on the surface of EPN particle could react with epoxy resin,and the viscosity of the system added by EPN particle could meet the requirements of material process. EPN particle had a good toughening effect on epoxy resin,and when the addition amount was about 6%,it could make the impact strength of resin matrix reach more than 51 kJ/m2,which was 130%higher than that before toughening,and had no obvious effect on the Tgof the system at the same time. The research results of composite toughness showed that the G_(IC)and CAI of the composite material with 6% EPN addition increased by more than 60%,which had a significant toughening effect.

关 键 词：环氧树脂 纳米橡胶粒子 核壳粒子 增韧 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]