超分子组装层状结构具有前所未有的抗裂纹扩展能力的室温自修复软复合网络,Advanced Materials

当前位置： X-MOL 学术 › Adv. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

超分子组装层状结构具有前所未有的抗裂纹扩展能力的室温自修复软复合网络
Advanced Materials ( IF 27.4 ) Pub Date : 2023-03-25 , DOI: 10.1002/adma.202300937
JianHua Xu _{1,

2} , YuKun Li ₁ , Tong Liu ₁ , Dong Wang _{1,

3} , FuYao Sun ₁ , Po Hu ₁ , Lin Wang ₁ , JiaoYang Chen ₁ , XueBin Wang ₁ , BoWen Yao ₁ , JiaJun Fu ₁

Affiliation

柔软的自修复材料因其出色的顺应性、可扩展性和自恢复性而成为可拉伸设备的有力候选者。然而，大多数现有的软自修复聚合物由于其动态无定形、低能聚合物网络容易断裂，而遭受裂纹扩展和不可逆疲劳失效的困扰。在此，受生物组织独特的结构-性能关系的启发，提出了一种超分子界面组装策略，通过在动态和超拉伸聚（脲-氨基甲酸酯）内对优先排列的层状结构进行结构工程，制备具有前所未有的抗裂纹扩展能力的软自修复复合材料。矩阵（被拉长至原始长度的 24 750 倍）。这样的设计提供了世界纪录的断裂能（501.6 kJ m^-2）、超高疲劳阈值（4064.1 J m ^-2）和出色的弹性恢复性（13倍伸长后的尺寸恢复性），并保持低模量（1.2 MPa）、高拉伸性（3200%）和高室温自粘性-治疗效率（97%）。因此，所得复合材料代表了同类产品中最好的，甚至超越了大多数生物组织。层状二维过渡金属碳化物/碳氮化物（MXene）结构还具有相对较高的面内导热率，使复合材料能够作为可拉伸导热皮肤应用于机器人关节中以实现散热。目前的工作展示了一种可行的方法，如何将自主自愈、裂纹容限和抗疲劳性合并到未来的材料设计中。

"点击查看英文标题和摘要"

Room-Temperature Self-Healing Soft Composite Network with Unprecedented Crack Propagation Resistance Enabled by a Supramolecular Assembled Lamellar Structure

Soft self-healing materials are compelling candidates for stretchable devices because of their excellent compliance, extensibility, and self-restorability. However, most existing soft self-healing polymers suffer from crack propagation and irreversible fatigue failure due to easy breakage of their dynamic amorphous, low-energy polymer networks. Herein, inspired by distinct structure–property relationship of biological tissues, a supramolecular interfacial assembly strategy of preparing soft self-healing composites with unprecedented crack propagation resistance is proposed by structurally engineering preferentially aligned lamellar structures within a dynamic and superstretchable poly(urea-ureathane) matrix (which is elongated to 24 750× its original length). Such a design affords a world-record fracture energy (501.6 kJ m⁻²), ultrahigh fatigue threshold (4064.1 J m⁻²), and outstanding elastic restorability (dimensional recovery from 13 times elongation), and preserving low modulus (1.2 MPa), high stretchability (3200%), and high room-temperature self-healing efficiency (97%). Thereby, the resultant composite represents the best of its kind and even surpasses most biological tissues. The lamellar 2D transition-metal carbide/carbonitride (MXene) structure also leads to a relatively high in-plane thermal conductivity, enabling composites as stretchable thermoconductive skins applied in joints of robotics to thermal dissipation. The present work illustrates a viable approach how autonomous self-healing, crack tolerance, and fatigue resistance can be merged in future material design.

更新日期：2023-03-25

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南