Reinforcement of the interfacial interaction between epoxy adhesives and metallic materials was achieved by using poly(glycidyl methacrylate) (PGMA) with N-(3,4-dihydroxyphenethyl)methacrylamide (DOPAm) fragments. The copolymer, namely P(GMA-co-DOMAm), was synthesized via reversible addition–fragmentation chain-transfer polymerization. Because of the catechol anchoring, the polymeric layer was successfully prepared by immersing metals in the copolymer solution for 1 h. The single-lap shear test demonstrated that the ultimate lap shear strength of the adherent with the polymeric layer was almost twice stronger than the bare one when the epoxy resin was utilized as adhesives. The X-ray photoelectron spectroscopic measurement at the adherent/adhesive interface revealed that the catechol-anchoring effect, as well as the cross-linking between the polymer brush and adhesives dramatically improved the performance of epoxy adhesives.

中文翻译：

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使用具有邻苯二酚和环氧基团的聚合物增强环氧树脂在金属表面的附着力

通过使用带有N-（3,4-二羟基苯乙基）甲基丙烯酰胺（DOPAm）片段的聚（甲基丙烯酸缩水甘油酯）（PGMA），可以增强环氧粘合剂与金属材料之间的界面相互作用。共聚物，即P（GMA- co-DOMAm），是通过可逆的加成-断裂链转移聚合反应合成的。由于邻苯二酚的锚定，通过将金属浸入共聚物溶液中1 h成功地制备了聚合物层。单搭接剪切试验表明，当将环氧树脂用作粘合剂时，具有聚合物层的粘合剂的最终搭接剪切强度几乎是裸露的两倍。粘合剂/粘合剂界面的X射线光电子能谱测量表明，邻苯二酚的固着效果以及聚合物刷和粘合剂之间的交联极大地改善了环氧粘合剂的性能。