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Highly compressible glass-like supramolecular polymer networks
Nature Materials ( IF 41.2 ) Pub Date : 2021-11-25 , DOI: 10.1038/s41563-021-01124-x
Zehuan Huang 1 , Xiaoyi Chen 1 , Stephen J K O'Neill 1 , Guanglu Wu 1 , Daniel J Whitaker 1 , Jiaxuan Li 1 , Jade A McCune 1 , Oren A Scherman 1
Affiliation  

Supramolecular polymer networks are non-covalently crosslinked soft materials that exhibit unique mechanical features such as self-healing, high toughness and stretchability. Previous studies have focused on optimizing such properties using fast-dissociative crosslinks (that is, for an aqueous system, dissociation rate constant kd > 10 s1). Herein, we describe non-covalent crosslinkers with slow, tuneable dissociation kinetics (kd < 1 s−1) that enable high compressibility to supramolecular polymer networks. The resultant glass-like supramolecular networks have compressive strengths up to 100 MPa with no fracture, even when compressed at 93% strain over 12 cycles of compression and relaxation. Notably, these networks show a fast, room-temperature self-recovery (< 120 s), which may be useful for the design of high-performance soft materials. Retarding the dissociation kinetics of non-covalent crosslinks through structural control enables access of such glass-like supramolecular materials, holding substantial promise in applications including soft robotics, tissue engineering and wearable bioelectronics.



中文翻译:

高度可压缩的玻璃状超分子聚合物网络

超分子聚合物网络是非共价交联的软材料,具有独特的机械特性,如自修​​复、高韧性和可拉伸性。以前的研究主要集中在使用快速解离交联优化这些特性(即,对于水性系统,解离速率常数kd  > 10 s 1)。在此,我们描述了具有缓慢、可调节解离动力学的非共价交联剂 ( k d  < 1 s -1) 使超分子聚合物网络具有高压缩性。由此产生的玻璃状超分子网络具有高达 100 MPa 的抗压强度而没有断裂,即使在 93% 的应变下压缩超过 12 个压缩和松弛循环。值得注意的是,这些网络显示出快速的室温自恢复(< 120 s),这可能对高性能软材料的设计很有用。通过结构控制延缓非共价交联的解离动力学,可以获取此类玻璃状超分子材料,在软机器人、组织工程和可穿戴生物电子学等应用中具有重大前景。

更新日期:2021-11-25
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