Abstract Core-shell structured particle contains Fe2O3 as core and amino phenol formaldehyde resin as shell (Fe2O3@APFS) has been synthesized. The results of SEM and TEM test indicate that the obtained Fe2O3@APFS particle is monodisperse and possesses uniform core-shell structure. Its diameter is about 100 nm and the thickness of APFS layer is about 30 nm. The effects of Fe2O3@APFS on the physicochemical properties of cured epoxy composites have been systematically investigated. The cured Fe2O3@APFS/epoxy composites demonstrated enhanced mechanical and thermal properties. A maximum tensile strength of 94.3 MPa was obtained when 4 wt% loading Fe2O3@APFS particles was added. The fracture toughness of epoxy composites with 5 wt% Fe2O3@APFS loading reaches a value of up to 1.71 MPa·m1/2, which is 80% higher than that of pure epoxy resin. The glass transition temperature (Tg) of cured Fe2O3@APFS/epoxy composites was increased by 13.9 °C than that of pure epoxy resin. TEM observation illustrates that Fe2O3@APFS was monodisperse in epoxy matrix. Monodispersion of Fe2O3@APFS, covalent bond linked interface between Fe2O3@APFS and epoxy matrix and synergistic effect of Fe2O3 and APFS were responsible for the enhanced mechanical and thermal properties of epoxy composites. This work provides a new insight into the combination of soft and rigid fillers used to modify polymer.

中文翻译：

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一种具有增强机械和热性能的新型 Fe2O3@APFS/环氧树脂复合材料

摘要 合成了以Fe2O3为核、氨基酚醛树脂为壳的核壳结构颗粒(Fe2O3@APFS)。SEM和TEM测试结果表明，所获得的Fe2O3@APFS颗粒是单分散的，具有均匀的核壳结构。它的直径约为 100 nm，APFS 层的厚度约为 30 nm。已经系统地研究了 Fe2O3@APFS 对固化环氧复合材料物理化学性能的影响。固化的 Fe2O3@APFS/环氧树脂复合材料表现出增强的机械和热性能。当添加 4 wt% Fe2O3@APFS 颗粒时，获得的最大拉伸强度为 94.3 MPa。Fe2O3@APFS负载量为5wt%的环氧树脂复合材料的断裂韧性达到1.71MPa·m1/2，比纯环氧树脂高80%。固化后的 Fe2O3@APFS/环氧树脂复合材料的玻璃化转变温度（Tg）比纯环氧树脂提高了 13.9°C。TEM 观察表明 Fe2O3@APFS 在环氧树脂基体中是单分散的。Fe2O3@APFS 的单分散、Fe2O3@APFS 与环氧树脂基体之间的共价键连接界面以及 Fe2O3 和 APFS 的协同作用是提高环氧树脂复合材料机械和热性能的原因。这项工作提供了对用于改性聚合物的软硬填料组合的新见解。Fe2O3@APFS 与环氧树脂基体之间的共价键连接界面以及 Fe2O3 和 APFS 的协同作用是提高环氧树脂复合材料机械和热性能的原因。这项工作提供了对用于改性聚合物的软硬填料组合的新见解。Fe2O3@APFS 与环氧树脂基体之间的共价键连接界面以及 Fe2O3 和 APFS 的协同作用是提高环氧树脂复合材料机械和热性能的原因。这项工作提供了对用于改性聚合物的软硬填料组合的新见解。