Room-Temperature Self-Healing Polymers Based on Dynamic-Covalent Boronic Esters,Macromolecules

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Room-Temperature Self-Healing Polymers Based on Dynamic-Covalent Boronic Esters
Macromolecules ( IF 5.1 ) Pub Date : 2015-03-26 00:00:00 , DOI: 10.1021/acs.macromol.5b00210
Jessica J. Cash ₁ , Tomohiro Kubo ₁ , Abhijeet P. Bapat ₁ , Brent S. Sumerlin ₁

Affiliation

Cross-linked polymers constructed with dynamic-covalent boronic esters were synthesized via photoinitiated radical thiol–ene click chemistry. Because the reversibility of the boronic ester cross-links was readily accessible, the resulting materials were capable of undergoing bond exchange to covalently mend after failure. The reversible bonds of the boronic esters were shown to shift their exchange equilibrium at room temperature when exposed to water. Nevertheless, the materials were observed to be stable and hydrophobic and absorbed only minor amounts of water over extended periods of time when submerged in water or exposed to humid environments. The facile reversibility of the networks allowed intrinsic self-healing under ambient conditions. Highly efficient self-healing of these bulk materials was confirmed by mechanical testing, even after subjecting a single site to multiple cut–repair cycles. Several variables were considered for their effect on materials properties and healing, including cross-link density, humidity, and healing time.

中文翻译：

基于动态共价硼酯的室温自修复聚合物

通过光引发的自由基硫醇烯点击化学合成了由动态共价硼酸酯构成的交联聚合物。由于硼酸酯交联的可逆性易于获得，因此所得材料能够进行键交换以在失效后进行共价修补。当暴露于水时，硼酸酯的可逆键显示出在室温下改变它们的交换平衡。然而，观察到该材料是稳定的和疏水的，并且当浸入水中或暴露在潮湿的环境中时，在较长的时间段内仅吸收少量的水。网络的易逆性允许在环境条件下进行固有的自我修复。通过机械测试证实了这些散装材料的高效自我修复，即使在单个站点上进行多个切割-修复循环之后也是如此。考虑了几个变量对材料性能和修复的影响，包括交联密度，湿度和修复时间。

更新日期：2015-03-26

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