Self-Healable Silicone Elastomer Based on the Synergistic Effect of the Coordination and Ionic Bonds
Self-Healable Silicone Elastomer Based on the Synergistic Effect of the Coordination and Ionic Bonds
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基于配位键和离子键协同效应的自修复有机硅弹性体
DOI：
10.1021/acsapm.1c00236
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发表时间：
2021-05
影响因子：
5
通讯作者：
Ming Tian
中科院分区：
文献类型：
--
作者：
Shui Yu;Hongli Zuo;Xiaowei Xu;Nanying Ning;Bing Yu;Liqun Zhang;Ming Tian
具有机械强度和自愈合性能的有机硅弹性体的构造可以通过多种动态键合策略被验证为有效的方法。然而，这意味着需要一些复杂的合成策略或具有特定化学结构的小分子。因此，直接用成熟的方法构造具有两种相互作用的聚合物基体更具挑战性。本文报道了一种具有两种相互作用的动态硅橡胶，它是通过引入“羧基-氨基离子键”和“羧基-Al ~（3+）配位离子键”而制备的。羧基分别与氨基和Al ~（3+）离子键合形成普通离子键和配位离子键。这些强和弱的离子协同相互作用的共存，通过设置在光谱分析和力学测试的几个实验进行了验证。结果表明，羧基与Al 3+的相互作用能有效地提高材料的力学性能，而羧基与氨基之间形成的致密的共离子网络能保持动态交联网络的完整性，从而保证了硅橡胶具有良好的可恢复性和自修复性。与基于单一离子键的对照样品相比，杂化网络具有更好的力学性能，最佳拉伸强度为10.73MPa，断裂伸长率为10.548%，并且在较高温度下具有良好的自主自愈合能力（8h，在60 °C下80-136%）和在大规模拉伸下相当大的可恢复性（约70%的断裂伸长率），具有仅28.7%的适度低滞后比。我们期望这种策略将有利于扩展一种方便的混合方式，通过多种动态键策略制备具有同步机械性能和自愈合性能的弹性体。
The construction of silicone elastomers with mechanical strength and a self-healing property can be verified as an effective method by multiple dynamic bond strategies. However, it means that some complex synthesis strategies or small molecules with specific chemical structures are required. So, it is more challenging to construct a kind of polymer matrix with two kinds of interactions by matured methods directly. Herein, we report a dynamic silicone elastomer with two kinds of interactions that was prepared by incorporating a “carboxyl-amino ionic bond” and “carboxyl-Al3+coordinated ionic bond”. The carboxyl groups are bonded with amino groups and Al3+ions to form common ionic bonds and coordinated ionic bonds, respectively. The coexistence of these strong and weak ionic synergistic interactions was verified by setting several experiments in spectroscopic analysis and mechanical tests. It was indicated that the carboxyl-Al3+interactions can improve the mechanical property of this material effectively, while the dense common ionic network between carboxyl and amino groups can maintain the integrity of the dynamic cross-linking network, which may ensure the good recoverability and self-healable ability of the silicone elastomer. Compared with the control samples based on single ionic bonds, the hybrid network exhibited the better mechanical property with an optimistic tensile strength of ∼0.73 MPa and elongation at breaking of ∼548%, and the network also exhibited a good autonomous self-healing ability at a higher temperature (8 h, 80–136% at 60 °C) and a considerable recoverability at a large scale of stretching (∼70% of elongation at break) with a moderate low hysteresis ratio of only 28.7%. We expect this strategy would be beneficial for the expansion of a convenient way of mixing to prepare elastomers with a synchronous mechanical property and self-healing performance by multiple dynamic bond strategies.
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DOI：
10.1002/adma.201702616
发表时间：
2017-10
期刊：
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