Epoxy (LY-556/HY-951) system was cured at ambient temperature and its copper cobaltite nanocomposites with different percentage loadings of nanoparticles were prepared via powered shear mixing with HY-951 (triethylene-tetra-amine, TETA) hardener. Characterizations of the nanocomposites were done by various methods like XRD, TEM, FTIR, TGA, DSC, SEM, VNA, DETA and XPS. XRD, XPS and TEM showed the successful preparation of copper cobaltite nanoparticles. Further, FTIR studies confirmed accomplishment of curing and consequently the formation of cross-linked network in the nanocomposites. The morphological analysis revealed that the nanoparticles of the copper cobaltite were uniformly distributed inside the epoxy matrix to 5% loading. The enhancement in impact properties of nanocomposites with increase in filler content was supported by fractured surface studies for even distribution of copper cobaltite nanoparticles. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analyses showed enhancement in thermal stability as well as positive shift in the glass transition temperature for epoxy with copper cobaltite filler in comparison to neat epoxy resin. The positive shift in the glass transition temperature of the nanocomposites indicated improved interaction between copper cobaltite and epoxy matrix. These nanocomposites were also evaluated for their electromagnetic properties using dielectric thermal analyzer (DETA) and vector network analyzer (VNA) for determination of their permittivity and permeability, respectively. The improved thermal, mechanical and electromagnetic properties of epoxy–copper cobaltite nanocomposites make them potential candidates for microwave applications in a wide range of areas.

中文翻译：

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环氧-铜钴矿纳米复合材料的形态特征、介电和热性能：制备和表征

环氧树脂（LY-556/HY-951）体系在环境温度下固化，通过与HY-951（三乙烯-四胺，TETA）硬化剂的动力剪切混合制备具有不同纳米颗粒负载量的钴酸铜纳米复合材料。纳米复合材料的表征通过各种方法进行，如 XRD、TEM、FTIR、TGA、DSC、SEM、VNA、DETA 和 XPS。XRD、XPS 和 TEM 表明成功制备了钴酸铜纳米颗粒。此外，FTIR 研究证实了固化的完成，从而在纳米复合材料中形成了交联网络。形态分析表明，钴酸铜纳米颗粒均匀分布在环氧树脂基体中，负载量为 5%。纳米复合材料的冲击性能随着填料含量的增加而增强，这得到了钴钴矿纳米粒子均匀分布的断裂表面研究的支持。热重分析 (TGA) 和差示扫描量热法 (DSC) 分析表明，与纯环氧树脂相比，含钴酸铜填料的环氧树脂的热稳定性增强，玻璃化转变温度正移。纳米复合材料玻璃化转变温度的正移表明钴酸铜和环氧树脂基体之间的相互作用得到改善。还使用介电热分析仪 (DETA) 和矢量网络分析仪 (VNA) 评估了这些纳米复合材料的电磁性能，分别测定了它们的介电常数和磁导率。改进的热量，