Thermomechanical activation achieving orthogonal working/healing conditions of nanostructured tri-block copolymer thermosets
Thermomechanical activation achieving orthogonal working/healing conditions of nanostructured tri-block copolymer thermosets
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DOI：
10.1016/j.xcrp.2021.100483
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发表时间：
2021-07-21
影响因子：
8.9
通讯作者：
Chen, Eugene Y. -X.
中科院分区：
文献类型：
--
作者：
Clarke, Ryan W.;McGraw, Michael L.;Chen, Eugene Y. -X.
传统的热固性材料尽管在当今的材料经济中具有重要的技术意义，但由于其缺乏可回收性或可再加工性的使用寿命结束选择，因此提出了现代可持续性挑战。新兴的共价自适应网络（can）为永久交联材料提供了可持续的替代品，但目前的热化学激活机制很难实现理想的正交工作/后处理条件。在这里，我们报道了一种基于酸-酸酐键交换的热塑性弹性体网络的CAN系统，该系统无添加剂/催化剂，完全可再加工，交联，三嵌段共聚物（tri-BCP）热塑性弹性体网络在热机械激活机制下运行。三bcp结构的独特功能使其能够自组装成相互连接的六边形填充圆柱体纳米结构，在没有热和机械（加热和压缩）加工条件的情况下，可以防止任何有效的圆柱体间键交换（从而产生蠕变）。
Conventional thermosets, despite their technological significance in today's materials economy, present a modern sustainability challenge because of their lack of end-of-life options for recyclability or reprocessability. Emerging covalent adaptable networks (CANs) offer sustainable alternatives to permanently crosslinked materials, but ideal orthogonal working/reprocessing conditions are hardly achievable by the current thermochemical activation mechanism. Here we report a CAN system of additive/catalyst-free, fully reprocessable, crosslinked, tri-block copolymer (tri-BCP) thermoplastic elastomer networks based on acid-anhydride bond exchange operated on a thermomechanical activation mechanism. The unique functionality of the tri-BCP architecture enables self-assembly into inter linked, hexagonally packed cylinder nanostructures that preclude any productive inter-cylinder bond exchange (and, thus, creep) without cooperative thermal and mechanical (heating and compression) processing conditions.