一种由sp2杂化硼-氨基甲酸乙酯键的氢键相互作用而产生的超坚固、坚韧、可拉伸和超高弹性恢复的超分子弹性体，这一成果由中国林业科学研究院林产化学工业研究所刘合小组经过不懈努力而取得。相关论文发表在2025年3月10日出版的《德国应用化学》杂志上。

弹性体在日常生活和工业中无处不在，然而，开发一种具有优异应力和韧性的弹性体是一项巨大的挑战。本文设计了一种基于苯硼酸sp2杂化轨道的高强度、高韧性、高弹性弹性体。由于硼的sp2杂化，网络的空间构象变得更加紧凑。这增强了超分子氢键相互作用，从而显著改善了材料的机械性能。值得注意的是，聚氨酯链段的氢键能提高了37%。氢键结合使弹性体具有超高的真应力（1.30GPa）、超高的韧性（442.2 MJ·m^-3）和167.8 N·mm^-1的抗穿刺强度。材料在连续拉伸循环中表现出优异的抗疲劳性能，室温静置后不可逆变形消失。

此外，弹性体具有非凡的弹性恢复能力，在延长16倍后迅速恢复到原始长度。这项工作提供了一种策略，可以利用分子间相互作用的空间构象变化来增强和增韧材料的机械性能。

附：英文原文

Title: An ultra robust tough, stretchable, and super high elastic recovery supramolecular elastomer resulting from hydrogen-bond interaction by sp2 hybridized boron-urethane bonds

Author: Yuehan Qian, Fuhao Dong, Shanshan Wang, Yunmeng Jiang, Xu Xu, He Liu

Issue&Volume: 2025-03-10

Abstract: Elastomers are omnipresent in everyday life and industry, yet the development of an elastomer with both superb stress and toughness presents a prodigious challenge. In this report, a high-strength, tough, and high-elastic elastomer derived from sp2 hybrid orbitals of phenylboronic acid was designed. The spatial conformation of network becomes significantly more compact due to the sp2 hybridization of boron. This enhances supramolecular hydrogen bonding interactions, resulting in a marked improvement in the material’s mechanical properties. Notably, the hydrogen bonding energy in the polyurethane chain segments enhanced by 37%. The robust hydrogen bonding imparts the elastomer with super high true stress (1.30 GPa), superior toughness (442.2 MJ·m-3), and super puncture resistance strength of 167.8 N·mm-1. The material exhibited excellent fatigue resistance during continuous tensile cycles, while the irreversible deformation disappeared after standing at room temperature. Moreover, the elastomer bespeaks extraordinary elastic restorability, swiftly reverting to its primitive length after being extended to 16 times. This work provides a strategy that the mechanical properties of materials can be enhanced and toughened by utilizing spatial conformational changes in intermolecular interactions.

DOI: 10.1002/anie.202421099

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202421099