A supramolecular polymer with ultra-stretchable, notch-insensitive, rapid self-healing and adhesive properties,Polymer Chemistry

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A supramolecular polymer with ultra-stretchable, notch-insensitive, rapid self-healing and adhesive properties
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-12-14 , DOI: 10.1039/d0py01536a
Lun Zhang _{1,

2,

3,

4} , Dong Wang _{1,

2,

3,

4} , Liqiang Xu _{1,

2,

3,

4} , Aimin Zhang _{1,

2,

3,

4}

Affiliation

Supramolecular elastomers, possessing excellent mechanical, reusable adhesivity, and rapid self-healing properties, are essential for use in various applications. Herein, we developed a novel polyamide-urea elastomer with metal–ligand interactions and hydrogen bonds forming synergetic double dynamic bonds. Physical crosslinking endows the polyamide-urea elastomer with extreme stretchability and rapid self-healing ability at room temperature. The representative polyamide-urea elastomer, DPPy₁–Fe₂, can be stretched to 40× its original length without breaking, and has extraordinary notch-insensitive elongation of up to 3500%. Meanwhile, DPPy₁–Fe₂ can fully restore its elasticity modulus within 5 min at room temperature, and the elongation also reaches 3000% after 30 min of healing. In addition, the unique dynamic bonds of the supramolecule enable it to repeatedly and firmly adhere to different surfaces. The shear strength of DPPy₁–Fe₂ is restored to an appreciable 80% after the first detachment–reattachment cycle, with it still possessing excellent adhesive strength after multiple cycles. As a result, the supramolecular elastomer shows outstanding stretchability, tear-resistance, quick self-repairing, and reusable adhesivity, which will facilitate the progress of intelligent adhesivity and flexible electronics.

中文翻译：

具有超伸缩性，对缺口不敏感，快速自愈和粘合性能的超分子聚合物

具有出色的机械性能，可重复使用的粘合性和快速的自修复性能的超分子弹性体对于各种应用至关重要。在这里，我们开发了一种新型的聚酰胺-脲弹性体，它具有金属-配体相互作用和氢键形成协同双动态键。物理交联使聚酰胺-脲弹性体在室温下具有极好的拉伸性和快速的自愈能力。代表性的聚酰胺-脲弹性体DPPy ₁ -Fe ₂可以拉伸至其原始长度的40倍而不会断裂，并且具有非凡的对缺口不敏感的伸长率，最高可达3500％。同时，DPPy ₁ –Fe ₂能在室温下5分钟内完全恢复其弹性模量，愈合30分钟后的伸长率也达到3000％。此外，超分子的独特动态键使它能够反复牢固地粘附在不同的表面上。在第一次拆装后，DPPy ₁ –Fe ₂的剪切强度恢复到可观的80％，在多次循环后仍具有出色的粘合强度。结果，超分子弹性体显示出优异的可拉伸性，抗撕裂性，快速的自我修复和可重复使用的粘合性，这将促进智能粘合性和柔性电子学的发展。

更新日期：2021-01-11

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