Rapid and contactless on-demand debonding and rebonding of high-strength joints is a promising solution for quick attachment, repairs, disassembly, and recycling of structural systems. Herein we show that rapid and contactless on-demand debonding and rebonding can be achieved by incorporating ferrimagnetic iron oxide nanoparticles (Fe₃O₄) into poly(ethylene-methacrylic acid) (EMAA). When subjected to an external alternating magnetic field, the ferrimagnetic nanoparticles generate localized heat which melt the EMMAA, resulting in quick (<1 min) debonding and rebonding. The strength of the adhesive bond matches that achieved by conventional oven heating, exceeding the highest value reported for reversible adhesives in the literature. The results also show that, for the first time, the ferrimagnetic nanoparticles are effective in retaining 100% of the original bond strength for up to five cycles of repeated debonding and rebonding. Analytical and computational models have been developed to characterize the effects of key design parameters, such as Fe₃O₄ mass loading and magnetic flux on the heating performance and bond strength. The model correlates well with experimental results and reveals that magnetic hysteresis loss is more efficient than eddy current generated by conductive fillers for heating the adhesive. The high-strength EMAA/Fe₃O₄ adhesive is a very promising solution for contactless, on-demand, repeated adhesion applications to complex geometries and in hard-to-access locations.

高强度接头的快速和非接触式按需脱粘和重新粘合是结构系统快速连接、维修、拆卸和回收的有前途的解决方案。在此，我们展示了通过将亚铁磁性氧化铁纳米粒子 (Fe ₃ O ₄) 转化为聚（乙烯-甲基丙烯酸）（EMAA）。当受到外部交变磁场时，亚铁磁性纳米颗粒会产生局部热量，熔化 EMMAA，导致快速（<1 分钟）脱粘和重新粘合。粘合强度与传统烤箱加热达到的强度相匹配，超过了文献中报道的可逆粘合剂的最高值。结果还表明，亚铁磁性纳米粒子第一次有效地保持 100% 的原始粘合强度，长达五次重复脱粘和再粘合循环。已经开发了分析和计算模型来表征关键设计参数的影响，例如 Fe ₃ O ₄质量载荷和磁通量对加热性能和结合强度的影响。该模型与实验结果具有很好的相关性，并表明磁滞损耗比用于加热粘合剂的导电填料产生的涡流更有效。高强度 EMAA/Fe ₃ O ₄粘合剂是一种非常有前途的解决方案，适用于复杂几何形状和难以接近的位置的非接触式、按需、重复粘合应用。