The reinforcing effects of functionalized graphene sheets (FGSs) on thermosetting epoxies are examined to understand the feasibility of these FGSs–epoxy nanocomposites in composite applications. The nanocomposites are prepared by compression molding with different graphene contents (0, 1, and 3 wt%) and different chemical treatments including FGSs and reduced graphene oxide (RGO) nanosheets. In addition, two silane molecules (octyltriethoxysilane [OTES] and glycidoxypropyltrimethoxysilane [GPTMS]) are used as coupling agents. Morphological analysis shows that the use of functionalized graphene oxide nanosheets in woven glass fabric/epoxy nanocomposites significantly improves the dispersion distribution of graphene nanosheets inside the matrix and increases their interfacial adhesion. The results reveal that the nanocomposites containing functionalized graphene nanosheets show the most promising improvement in terms of thermal and mechanical properties. In particular, Young's modulus increases by up to 17% and 25% with only 3% of functionalized graphene oxide using OTES and GPTMS, respectively. The result of the water droplet contact angle of the nanocomposites reinforced by graphene oxide functionalized by octyltriethoxysilane (OTES) shows an increase to a value of 105.80, indicating the super hydrophobic nature.

中文翻译：

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功能化石墨烯纳米片和玻璃纤维布增强环氧树脂的力学性能和导热系数

考察了功能化石墨烯片（FGSs）对热固性环氧树脂的增强作用，以了解这些FGSs-环氧纳米复合材料在复合材料应用中的可行性。通过压缩模塑具有不同石墨烯含量（0、1和3 wt％）和包括FGS和还原型氧化石墨烯（RGO）纳米片在内的不同化学处理来制备纳米复合材料。另外，使用两个硅烷分子（辛基三乙氧基硅烷[OTES]和环氧丙氧基丙基三甲氧基硅烷[GPTMS]）作为偶联剂。形态分析表明，在机织玻璃纤维布/环氧树脂纳米复合材料中使用功能化的氧化石墨烯纳米片可显着改善石墨烯纳米片在基体内的分散分布并增加其界面粘合力。结果表明，就热和机械性能而言，包含功能化石墨烯纳米片的纳米复合材料显示出最有希望的改进。特别是，使用OTES和GPTMS分别仅使用3％的官能化氧化石墨烯，杨氏模量分别提高了17％和25％。由辛基三乙氧基硅烷（OTES）官能化的氧化石墨烯增强的纳米复合材料的水滴接触角结果显示增加到105.80，表明具有超疏水性。