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首页> 外文期刊>Advanced Functional Materials >Transparent, Mechanically Strong, Extremely Tough, Self-Recoverable, Healable Supramolecular Elastomers Facilely Fabricated via Dynamic Hard Domains Design for Multifunctional Applications
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Transparent, Mechanically Strong, Extremely Tough, Self-Recoverable, Healable Supramolecular Elastomers Facilely Fabricated via Dynamic Hard Domains Design for Multifunctional Applications

机译：透明，机械强度高，极其坚韧，可自我恢复，可修复的超分子弹性体，可通过动态硬域设计方便地用于多功能应用

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摘要

The design and synthesis of supramolecular self-healing polymers with high healing efficiency and excellent integrated mechanical properties is challenging due to conflicting attributes of dynamic self-healing and mechanical properties. Herein, this study introduces a design concept, that is, "dynamic hard domains," to balance self-healing performance, mechanical strength, elastic recovery, and at the same time obtain extreme toughness. The essential features of the dynamic hard domains include: (i) a noncrystallized and loose structure, (ii) low binding energy and high mobility, and (iii) sequential dissociation and rapid rearrangement. Based on this strategy, a simple one-step polycondensation route is reported to synthesize a transparent polyurethane-urea supramolecular elastomer (PPGTD-IDA), which successfully combines decent mechanical strength, extreme toughness, outstanding notch-sensitiveness, self-recoverability, and room-temperature self-healing. Upon rupture, the PPGTD-IDA completely restores the mechanical properties within 48 h. Furthermore, the results demonstrate repeatable healing of mechanical properties and prominent antiaging healability. Taking advantages of merits of PPGTD-IDA, it can be utilized for fabricating impact-resistant materials for protection of aluminum alloys as well as stretchable and self-healing conductors, which exhibits unique characteristics such as stable conductivity during stretching (even after healing or with notch), and automatic elimination of the notch during stretching/releasing cycles.
机译：由于动态自愈和力学性能的相互矛盾，具有高愈合效率和优异的综合机械性能的超分子自愈聚合物的设计和合成面临挑战。在此，本研究引入了一种设计概念，即“动态硬域”，以平衡自我修复性能，机械强度，弹性恢复并同时获得极高的韧性。动态硬结构域的基本特征包括：（i）非结晶且疏松的结构，（ii）低结合能和高迁移率，以及（iii）顺序解离和快速重排。基于这种策略，据报道，一种简单的一步缩聚路线即可合成透明的聚氨酯-脲超分子弹性体（PPGTD-IDA），该合成体成功地结合了良好的机械强度，极强的韧性，出色的缺口敏感性，自恢复性和空间温度自愈。断裂后，PPTGD-IDA会在48小时内完全恢复机械性能。此外，结果证明了机械性能的可重复愈合和显着的抗衰老愈合性。利用PPGTD-IDA的优点，它可用于制造用于保护铝合金的抗冲击材料以及可拉伸和自愈的导体，该导体表现出独特的特性，例如在拉伸过程中具有稳定的导电性（即使在修复后或在固化过程中也是如此）。刻痕），并在拉伸/释放周期中自动消除刻痕。

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