环氧树脂/多巴胺增强芳纶纤维界面性能
胡锦澜1，李嘉杰1，张彦飞12，刘佩佩1，关静1，谢利鹏3
1. 中北大学材料科学与工程学院，太原 030051； 2. 山西省煤矿矿井水处理技术创新中心，太原 030006； 3. 西安长峰机电研究所，西安 710065
Interfacial Properties of Dopamine Reinforced Aramid Fiber/Epoxy Resin
Hu Jinlan1, Li Jiajie1, Zhang Yanfei12, Liu Peipei1, Guan Jing1, Xie Lipeng3
1. School of Materials Science and Engineering,North University of China,Taiyuan 030051,China; 2. Shanxi Coal Mine Water Treatment Technology Innovation Center,Taiyuan 030006,China; 3. Xi'an Changfeng Research Institute of Mechanical-electrical,Xi'an 710065,China
摘要：由于芳纶纤维表面光滑且呈现化学惰性 ，与环氧树脂等基体材料结合后界面性能较差。为此，采用多巴胺在不同时间下对改进型芳纶 Ⅲ纤维表面进行改性处理，并研究了对环氧树脂/多巴胺改性芳纶纤维界面性能的影响。对扫描电子显微镜对纤维改性前后表面形貌进行表征，发现纤维改性后表面粗糙度提高，利于与环氧树脂间界面结合。利用傅里叶变换红外光谱、X 射线光电子能谱对纤维改性前后基团和表面元素含量进行表征，改性后纤维表面活性基团增加，极性增强。通过热重分析表明聚多巴胺成功吸附在纤维表面。测量纤维表面接触角 ，改性后的接触角更小，有利于环氧树脂润湿纤维。采用横向丝束复合材料的拉伸强度表征环氧树脂/芳纶纤维的界面性能。最终确定了多巴胺浓度为 2 g/L，在多巴胺溶液中处理 4 h 为最佳条件，在该条件拉伸强度比为改性前提高了 28.06%，拉伸弹性模量提高了 14.68%。
Abstract：The surface of aramid fiber is smooth and chemically inert, and its interface performance with epoxy resin and other matrix materials is poor. For this reason, the surface of modified aramid III fiber (F-3 A) was modified with dopamine at different time, and the effect of the modification on the interfacial properties of epoxy resin/aramid fiber was studied. The surface morphology before and after the fiber modification was characterized by scanning electron microscope (SEM). The surface roughness of the modified fiber was improved, which was beneficial to the interface bonding with epoxy resin. The content of groups and surface elements before and after the modification of the fiber was characterized by infrared spectroscopy and X-ray photoelectron spectroscopy (XPS). After the modification, the surface active groups and polarity of the fiber increase. Thermogravimetric analysis shows that polydopamine is successfully adsorbed on the fiber surface. Measuring the contact angle of the fiber surface, the modified contact angle is smaller, and the epoxy resin will be easier to wet the fiber. The tensile strength of transverse tow composite (TFBC) is used to characterize the interfacial properties of aramid fiber/epoxy resin. Finally, the best condition is determined that dopamine concentration was 2 g/L and the fiber was treated in dopamine solution for 4 hours. At this condition, the tensile strength is 28.06% higher than that before modification, and the tensile modulus is 14.68% higher.
关键词：芳纶纤维；复合材料；环氧树脂；多巴胺；界面；表面改性
Keywords：aramid fiber; composite; epoxy resin; dopamine; interface; surface modification
本文引用格式：
胡锦澜，李嘉杰，张彦飞，等.环氧树脂/多巴胺增强芳纶纤维界面性能[J].工程塑料应用，2023，51(4)：36?41.
Hu Jinlan，Li Jiajie，Zhang Yanfei，et al. Interfacial properties of dopamine reinforced aramid fiber/epoxy resin[J]. Engineering Plastics Appli‐cation，2023，51(4)：36?41.
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