Abstract：
Novel reprocessable thermosetting adhesives (RTAs), which combine high adhesive strength, reusability, disassembly, and recyclability features, have attracted increasing attention. However, developing RTAs with a rapidly adhesive rate while ensuring high adhesive strength and self-healing ability is still a significant challenge. Here, we prepared a novel vitrimer called DAx-DTSAy, which can be used as an RTA. First, by adjusting the ratio of rigid and flexible segments, maximum tensile strength reached 35.92 MPa. Second, the combined effect of dynamic hydroxyl ester bonds and dynamic disulfide bonds resulted in a rapid stress relaxation behavior, with a complete relaxation time 13.6 times shorter than a vitrimer only cross-linked with hydroxy ester bonds. This feature endowed its good self-healing and reprocessing capabilities. After self-healing at 180 °C, the maximum healing rate of mechanical properties was 91.8%. After three reprocesses, the maximum recovery rate of tensile strength was 120.2%. Furthermore, the combination of rigid and flexible segments and the synergistic effect of dual dynamic covalent bonds made DAx-DTSAy capable of use as a high-performance RTA. The lap shear strength of a DAx-DTSAy film on stainless steel reached 18.18 MPa after 15 min, with a recovery rate of 91.9% after 5 rebonding cycles. Additionally, DAx-DTSAy can be disassembled in chemical agents and exhibited better insulation properties compared to traditional epoxy resins. DAx-DTSAy can be employed as a novel high-performance adhesive in applications such as electronic devices and transportation, contributing to the development of thermosetting adhesives toward recyclability and sustainability.
摘要：
新型可再加工的热固性粘合剂（RTA），结合了高粘合强度，可重用性，拆卸,和可回收特性，引起了越来越多的关注。然而,开发具有快速粘合速率的RTA，同时确保高粘合强度和自修复能力仍然是一个重大挑战。这里,我们准备了一个叫做DAx-DTSAy的小说，可以用作RTA。首先,通过调整刚性和柔性段的比例，最大抗拉强度达到35.92MPa。第二,动态羟基酯键和动态二硫键的共同作用导致了快速的应力松弛行为，完全弛豫时间比仅与羟基酯键交联的玻璃化聚合物短13.6倍。此功能赋予其良好的自我修复和再处理能力。在180°C下自我修复后，力学性能的最大愈合率为91.8%。经过三次再处理，拉伸强度的最大恢复率为120.2％。此外，刚性和柔性链段的结合以及双动态共价键的协同作用使DAx-DTSAy能够用作高性能RTA。15分钟后，不锈钢上DAx-DTSAy膜的搭接剪切强度达到18.18MPa，5次重新粘合循环后的回收率为91.9%。此外,与传统环氧树脂相比，DAx-DTSAy可以在化学试剂中分解，并表现出更好的绝缘性能。DAx-DTSAy可以作为一种新型的高性能粘合剂用于电子设备和运输等应用中，有助于热固性粘合剂朝着可回收性和可持续性发展。
