The interface improvement of fiber-reinforced composites has remained a vexing problem that limits the use of the excellent properties of fiber in composite applications. In this study, a novel water-based hybrid sizing agent was synthesized by in-situ generated silica within waterborne epoxy/waterborne epoxy curing agent system, which was used as a glass fiber (GF) surface modifier to enhance the interfacial properties of GF/epoxy (EP) composites. The morphology and wetting ability of GF after treated with the hybrid sizing agent, the single-GF tensile strength and the interfacial shear strength (IFSS) of the single-GF/EP composites were investigated. Experimental results showed that the wetting ability of GF and the IFSS of the single-GF/EP composites were significantly improved after being treated by the hybrid sizing agent. This work is aimed at developing an environment-friendly, safe, and effective water-based sizing for substituting the traditional solvent-based sizing.

纤维增强复合材料的界面改进仍然是一个棘手的问题，它限制了纤维在复合材料应用中的优异性能的使用。在这项研究中，通过在水性环氧/水性环氧固化剂体系中原位生成的二氧化硅合成了一种新型的水性混合上浆剂，该二氧化硅被用作玻璃纤维（GF）表面改性剂以增强GF / F的界面性能。环氧（EP）复合材料。研究了混合上浆剂处理后的GF的形貌和润湿能力，单GF / EP复合材料的单GF拉伸强度和界面剪切强度（IFSS）。实验结果表明，经混合施胶剂处理后，GF / EP复合材料的GF润湿能力和IFSS明显提高。