Mussel-inspiration is extensively utilized for multifunctional modification on the surface of universal materials. Polyphenols are more and more exploited for mussel-inspired chemistry to replace polydopamine owing to their ubiquitousness and inexpensiveness. Herein, to explore the interfacial properties between fully drawn yarn (FDY) polyester fiber-bundle and epoxy matrix, codeposition of polyethyleneimine/catechol (PEI/CCh) is used to modify FDY polyester fiber-bundles by mussel-inspired method. The orthogonal experiments are performed to obtain the optimum formula which is 2 g L⁻¹ PEI, 1 g L⁻¹ CCh, and 24 h codeposition time. The results of surface structure characterization measured via Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscope, and energy dispersive X-ray indicate that PEI/CCh aggregates are uniformly coated on fiber surface to fabricate continuously lamellar structures. The surface hydrophilicity and water infiltration rate constant are acquired by water contact angle. These results elucidated that FDY fiber surface is successfully endowed with polyethyleneimine/catechol aggregates and surface hydrophilicity greatly improved. Single fiber-bundle pull-out tests are conducted to evaluate the interfacial strength. Compared to pure fiber-bundle specimens, there are 67.57%, 57.63%, and 45.07% increase of initial debonding load, peak load, and interfacial shear strength, respectively.

中文翻译：

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聚乙烯亚胺/儿茶酚在完全拉伸的聚酯纤维束上的共沉积，用于研究与环氧树脂的界面特性

贻贝灵感广泛用于通用材料表面的多功能改性。由于多酚无处不在且价格低廉，多酚越来越多地被用于受贻贝启发的化学物质来替代聚多巴胺。在此，为了探索全拉伸丝 (FDY) 聚酯纤维束与环氧树脂基体之间的界面特性，采用聚乙烯亚胺/邻苯二酚 (PEI/CCh) 的共沉积通过贻贝启发的方法对 FDY 聚酯纤维束进行改性。进行正交实验以获得最佳配方，即 2 g L ^-1 PEI，1 g L ^-1 CCh 和 24 小时共沉积时间。通过傅里叶变换红外光谱、X 射线光电子能谱、扫描电子显微镜和能量色散 X 射线测量的表面结构表征结果表明，PEI/CCh 聚集体均匀地包覆在纤维表面，形成连续的层状结构。通过水接触角获得表面亲水性和水渗透速率常数。这些结果阐明了FDY纤维表面成功地赋予了聚乙烯亚胺/儿茶酚聚集体并且表面亲水性大大提高。进行单纤维束拉拔试验以评估界面强度。与纯纤维束试样相比，初始剥离载荷、峰值载荷和界面剪切强度分别增加了 67.57%、57.63% 和 45.07%，