Abstract Covalent bonds mediated interfaces are generally favorable for transferring interfacial stress and hence rationalizing the mechanical properties of the filled elastomeric composites. Aiming at reprocessable yet robust elastomeric composites, in this contribution, exchangeable interfacial crosslinks are introduced into the interfaces between epoxidized natural rubber (ENR) and multi-walled carbon nanotubes (MWCNTs). This is accomplished by functionalizing MWCNTs with carboxyl groups through diazo-coupling reaction and then incorporating the modified MWCNTs into diacid-cured ENR. Accordingly, covalent β-hydroxy ester bonds result in the interfaces between ENR and MWCNTs. The formation of covalent interfaces enables much uniform dispersion of MWCNTs and stronger interfacial adhesion. Comparing to the ENR filled with pristine MWCNTs, the modified composites exhibit much improved mechanical performance. Importantly, the exchangeable nature of interfacial β-hydroxy ester bonds has promoted effect on the reprocessibility of epoxy-MWCNTs vitrimers. Overall, we envision this interfacial strategy can provide an alternative avenue towards reprocessable yet robust elastomeric composites.

中文翻译：

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可交换界面交联到机械强度高的弹性体/碳纳米管玻璃体

摘要共价键介导的界面通常有利于转移界面应力，从而使填充弹性复合材料的机械性能合理化。针对可再加工但坚固的弹性复合材料，在这一贡献中，将可交换的界面交联引入环氧化天然橡胶 (ENR) 和多壁碳纳米管 (MWCNT) 之间的界面。这是通过重氮偶联反应用羧基官能化多壁碳纳米管，然后将改性多壁碳纳米管掺入二酸固化 ENR 来实现的。因此，共价 β-羟基酯键导致 ENR 和 MWCNT 之间的界面。共价界面的形成使多壁碳纳米管的分散更加均匀，界面附着力更强。与填充原始多壁碳纳米管的 ENR 相比，改性后的复合材料表现出大大提高的机械性能。重要的是，界面 β-羟基酯键的可交换性质促进了对环氧-MWCNTs 玻璃体的可再加工性的影响。总的来说，我们设想这种界面策略可以为可再加工但坚固的弹性复合材料提供替代途径。