浙江大学黄飞鹤团队报道了传统和超分子聚合物协同制备的自适应和坚固的玻璃体。相关研究成果于2024年4月8日发表于国际顶尖学术期刊《德国应用化学》。

玻璃体具有独特的机械性能、可再加工性和可回收性，这使其在广泛的应用中极具前景。然而，在玻璃质材料的预期使用温度下实现动态行为，从而通过缔合动态共价键将可再加工性与适应性相结合，是一个有吸引力但艰巨的目标。

该文中，研究人员将硼-氮（BN）配位键和BO共价键偶联，生成一类新的玻璃化物，硼-氮玻璃化物（BNV），赋予它们在使用温度下的动态特性。与没有BN配位键的硼酸酯玻璃化物（BEVs）相比，具有BN配位的BNVs表现出增强的机械性能。其优异的力学性能来自于配位BN超分子聚合物和共价硼酸酯网络的协同作用。此外，得益于BO动态共价键在其拓扑冻结温度（Tv）以上的缔合交换，所得到的BNVs也具有可加工性。

该项研究利用硼基玻璃化物的结构特征来实现材料增强和韧性增强，同时为新型玻璃化物材料的构建提供了新的设计理念。

附：英文原文

Title: Adaptive and Robust Vitrimers Fabricated by Synergy of Traditional and Supramolecular Polymers

Author: Jiao Wang, Wei You, Liya Chen, Ding Xiao, Xuedong Xiao, Tianyu Shan, Yang Liu, Ming Liu, Guangfeng Li, Wei Yu, Feihe Huang

Issue&Volume: 2024-04-08

Abstract: Vitrimers offer a unique combination of mechanical performance, reprocessability, and recyclability that makes them highly promising for a wide range of applications. However, achieving dynamic behavior in vitrimeric materials at their intended usage temperatures, thus combining reprocessability with adaptivity through associative dynamic covalent bonds, represents an attractive but formidable objective. Herein, we couple boron–nitrogen (BN) dative bonds and BO covalent bonds to generate a new class of vitrimers, boron–nitrogen vitrimers (BNVs), to endow them with dynamic features at usage temperatures. Compared with boronester vitrimers (BEVs) without BN dative bonds, the BNVs with BN dative bonds showcase enhanced mechanical performance. The excellent mechanical properties come from the synergistic effect of the dative BN supramolecular polymer and covalent boronester networks. Moreover, benefiting from the associative exchange of BO dynamic covalent bonds above their topological freezing temperature (Tv), the resultant BNVs also possess the processability. This study leveraged the structural characteristics of a boron-based vitrimer to achieve material reinforcement and toughness enhancement, simultaneously providing novel design concepts for the construction of new vitrimeric materials.

DOI: 10.1002/anie.202405761

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202405761