The toughening of epoxy resins is a relatively recent trend in composite technology. The use of rigid carbonaceous fillers or plasticizing additives is well established in the literature, but their combined use and their effect on thermal or mechanical properties of composites is hardly studied. The aim of this work is to investigate the combination of neat and silane-treated carbonaceous fillers (graphene oxide (GO) or graphite nanoplatelets (GNP)) with poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (EPE) triblock copolymers. The viscosity and curing behavior of the resin, as well as the dynamic mechanical and mechanical properties of the composites, were evaluated. Addition of EPE and GO slightly increased viscosity of the epoxy resin, and EPE acted as coupling and exfoliating agent of GO and GNP. EPE/GO-modified epoxy showed the lowest storage modulus and cross-link density, displaying in turn a more pronounced effect on impact strength and fracture toughness without sacrificing tensile and thermal properties. Treatment with APTES did not cause a significant effect on the composite properties.

中文翻译：

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碳质纳米填料和三嵌段共聚物对环氧树脂韧性的影响

环氧树脂的增韧是复合材料技术中相对较新的趋势。硬质碳质填料或增塑添加剂的使用在文献中得到了很好的证实，但它们的组合使用及其对复合材料的热或机械性能的影响却鲜有研究。这项工作的目的是研究纯和硅烷处理的碳质填料（氧化石墨烯（GO）或石墨纳米片（GNP））与聚（环氧乙烷）-聚（环氧丙烷）-聚（环氧乙烷）的组合（ EPE) 三嵌段共聚物。评估了树脂的粘度和固化行为，以及复合材料的动态机械和机械性能。EPE和GO的加入略微增加了环氧树脂的粘度，EPE作为GO和GNP的偶联剂和剥离剂。EPE/GO 改性环氧树脂表现出最低的储能模量和交联密度，进而在不牺牲拉伸和热性能的情况下对冲击强度和断裂韧性产生更显着的影响。用 APTES 处理不会对复合材料性能产生显着影响。