Self-Healable Acrylic-Based Covalently Adaptable Networks
Self-Healable Acrylic-Based Covalently Adaptable Networks
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DOI：
10.1021/acs.macromol.2c00739
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发表时间：
2022-06
期刊：
影响因子：
5.5
通讯作者：
Siyang Wang;Lei Li;Qianhui Liu;M. Urban
中科院分区：
文献类型：
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作者：
Siyang Wang;Lei Li;Qianhui Liu;M. Urban
将自主自愈和再加工结合在一种材料中可以延长使用寿命并实现形状配置的改变。我们开发了商品聚（（2-乙酰乙酰氧基）甲基丙烯酸乙酯/甲基丙烯酸甲酯/丙烯酸正丁酯）[p(AAEMA/MMA/nBA)]共聚物网络，该网络能够在无需干预的情况下进行自修复，并且无需再加工。热塑性p(AAEMA/MMA/nBA)是通过甲基丙烯酸(2-乙酰乙酰氧基)乙酯(AAEMA)、甲基丙烯酸甲酯(MMA)和丙烯酸正丁酯(nBA)共聚，然后与三三氨基乙胺(TREN)交联形成共价适应性网络(CAN)而获得的。该共聚物网络在环境条件下表现出自修复性，并在 120 °C 下通过压缩成型表现出可再加工性。使用一系列热机械和光谱工具，这些研究表明，可再加工性是通过动态交联的交换反应实现的，而自修复是通过能量上有利的链间范德华相互作用的恢复以及网络的插烯氨基甲酸酯部分中C=C键的可逆E⇌Z异构化来促进的。
Combining autonomous self-healing and reprocessing in one material offers an extended life span and enables shape configuration changes. We developed commodity poly((2-acetoacetoxy)ethyl methacrylate/methyl methacrylate/n-butyl acrylate) [p(AAEMA/MMA/nBA)] copolymer networks that are capable of both self-healing without intervention as well as reprocessing. The thermoplastic p(AAEMA/MMA/nBA) was obtained by copolymerizing (2-acetoacetoxy)ethyl methacrylate (AAEMA), methyl methacrylate (MMA), andn-butyl acrylate (nBA), followed by cross-linking with tristriaminoethyl amine (TREN) to form covalently adaptable networks (CANs). This copolymer network exhibits self-healability under ambient conditions and reprocessibility by compression molding at 120 °C. Using an array of thermo-mechanical and spectroscopic tools, these studies show that reprocessibility is achieved by the exchange reactions of dynamic cross-links, whereas self-healing is facilitated by the recovery of energetically favorable inter-chain van der Waals interactions accompanied by the reversibleE⇌Zisomerization of the C═C bonds in vinylogous urethane moieties of the network.