北京理工大学吴彪团队报道了阴离子配位Foldamer基聚合物网络：从分子弹簧到弹性体。相关研究成果发表在2024年4月16日出版的国际学术期刊《德国应用化学》。

Foldamer是螺旋弹簧的缩小版，可以通过构象变化吸收和释放能量。

该文中，研究人员通过使用基于阴离子配位的折叠体作为单体，开发了具有高密度分子弹簧的聚合物网络。折叠物的卷曲由与氯离子配位的低聚脲配体控制；随后，折叠体构象的折叠和展开赋予聚合物网络优异的能量耗散和韧性。

相应聚合物网络从P-L2UCl（非折叠）、P-L4UCl（1整圈）到P-L6UCl（1.5圈）的机械性能分别在强度（2.62MPa；14.26MPa；22.93MPa）、断裂伸长率（70%；325%；352%）、杨氏模量（2.69MPa；63.61MPa；141.50MPa）和韧性（1.12 MJ/m³；21.39MJ/m³；49.62MJ/m³）方面显著增加，这也优于没有阴离子中心的聚合物网络和基于非折叠物的聚合物网络。

此外，P-L6UCl显示出比大多数基于分子弹簧的聚合物网络增强的强度和韧性。

因此，该研究提出了一种设计高性能阴离子配位基材料的有效策略。

附：英文原文

Title: Anion-Coordination Foldamer-Based Polymer Network: from Molecular Spring to Elastomer

Author: Jiangping Qin, Yongming Wang, Tian Wang, Na Wang, Wenhua Xu, Lin Cheng, Wei Yu, Xuzhou Yan, Lingyan Gao, Bo Zheng, Biao Wu

Issue&Volume: 2024-04-16

Abstract: Foldamer is a scaled-down version of coil spring, which can absorb and release energy by conformational change. Here, polymer networks with high-density of molecular springs were developed by employing anion-coordination-based foldamers as the monomer. The coiling of the foldamer is controlled by oligourea ligands coordinating to chloride ions; subsequently, the folding and unfolding of foldamer conformations endow the polymer network with excellent energy dissipation and toughness. The mechanical performance of the corresponding polymer network shows a dramatic increase from P-L2UCl (non-folding), P-L4UCl (a full turn) to P-L6UCl (1.5 turns), in terms of strength (2.62 MPa; 14.26 Mpa; 22.93 Mpa), elongation at break (70%; 325%; 352%), Young’s modulus (2.69 MPa; 63.61 Mpa; 141.50 Mpa), and toughness (1.12 MJ/m3; 21.39 MJ/m3; 49.62 MJ/m3), respectively, which are also better than those without anion centers and the non-foldamer based counterparts. Moreover, P-L6UCl shows enhanced strength and toughness than most of the molecular-spring based polymer networks.Moreover, P-L6UCl shows enhanced strength and toughness than most of the molecular-spring based polymer networks. Thus, an effective strategy for designing high-performance anion-coordination-based materials is presented in this study.

DOI: 10.1002/anie.202400989

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202400989