A dynamic polyurea network with exceptional creep resistance,Journal of Materials Chemistry A

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A dynamic polyurea network with exceptional creep resistance
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-09-11 , DOI: 10.1039/d2ta05858h
Yan Ma ₁ , Hong-Qin Wang ₁ , Pei-Chen Zhao ₁ , Fang-Zhou Wang ₁ , Cheng-Hui Li ₁

Affiliation

Thermosetting polymers enjoy outstanding static performance at the expense of poor reprocessability and recyclability. The design of covalent adaptable networks (CANs) provides a possible solution, but most of them show poor solvent and creep resistance due to their dynamic nature. Herein, we designed and synthesized a new dynamic polyurea network with highly cross-linked inner “cores” and abundant flexible outer branches. The immobile inner “cores” can resist deformation during service and thus improve creep and chemical resistance, while the mobile outer branches can diffuse and rearrange at the interface to realize reprocessability. The new strategy offers new possibilities to seek a balance between material dynamic properties and static properties. Based on the dynamic and creep resistant polyurea network, a new adhesive with tough bonding strength as well as exceptional creep resistance and reprocessability was fabricated. Such high performance adhesive will be useful in automobile manufacture industry, construction industry, or even aerospace industry.

中文翻译：

具有出色抗蠕变性的动态聚脲网络

热固性聚合物以较差的可再加工性和可回收性为代价享有出色的静态性能。共价自适应网络 (CAN) 的设计提供了一种可能的解决方案，但由于它们的动态特性，它们中的大多数表现出较差的耐溶剂性和抗蠕变性。在此，我们设计并合成了一种新的动态聚脲网络，该网络具有高度交联的内部“核心”和丰富的柔性外部分支。固定的内部“核心”可以在使用过程中抵抗变形，从而提高抗蠕变性和耐化学性，而移动的外部分支可以在界面处扩散和重新排列，以实现可再加工性。新策略为寻求材料动态特性和静态特性之间的平衡提供了新的可能性。基于动态和抗蠕变的聚脲网络，制造了一种具有强粘合强度以及出色的抗蠕变性和可再加工性的新型粘合剂。这种高性能粘合剂将用于汽车制造行业、建筑行业，甚至航空航天行业。

更新日期：2022-09-16

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