Supramolecular elastomers: Switchable mechanical properties and tuning photohealing with changes in supramolecular interactions
Supramolecular elastomers: Switchable mechanical properties and tuning photohealing with changes in supramolecular interactions
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DOI：
10.1002/pola.28972
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发表时间：
2018-05
期刊：
影响因子：
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通讯作者：
A. Razgoniaev;Kirill I Mikhailov;Filipp A. Obrezkov;E. Butaeva;Alexis D. Ostrowski
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文献类型：
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作者：
A. Razgoniaev;Kirill I Mikhailov;Filipp A. Obrezkov;E. Butaeva;Alexis D. Ostrowski
为了研究超分子材料的光触发自愈合，我们合成了力学性能随温度可逆调节的超分子热塑性弹性体。通过改变超分子结构，我们创造了具有不同温度响应的聚合物。氢键材料的详细表征表明，由于氢键相互作用的变化，两种不同的稳定状态导致了显著不同的温度和机械应力响应。半结晶状态对振动剪切变形没有响应，而熔体状态表现为典型的能量耗散材料，其存储和损耗模数之间有明显的交叉。光激发生热的比较研究表明，当Fe(II)-邻菲咯啉发色团被物理地混合到氢键聚合物中或共价连接到超分子网络中时，光热转化没有差别。只要材料的吸光度和激光激发的重叠足够，这些材料就表现出用光照射治愈划痕的效果。根据超分子相互作用的类型，观察到光愈合效率和速率的不同，这归因于材料模数的热响应的不同。这些结果为如何设计具有生色团和超分子键相互作用的材料提供了洞察，以调整材料的光疗效率。2018年威利期刊公司J.Polym。科学，A部分：多晶硅。化学。2018年。
To study light-triggered self-healing in supramolecular materials, we synthesized supramolecular thermoplastic elastomers with mechanical properties that were reversibly modulated with temperature. By changing the supramolecular architecture, we created polymers with different temperature responses. Detailed characterization of the hydrogen-bonding material revealed dramatically different temperature and mechanical stress response due to two different stable states with changes in the hydrogen bonding interactions. A semi-crystalline state showed no response to oscillatory shear deformations while the melt state behaved as a typical energy dissipative material with a clear crossover between storage and loss moduli. Comparison studies on heat generation after light excitation revealed no differences in photo-thermal conversion when an Fe(II)-phenanthroline chromophore was either physically blended into the H-bonding polymer or covalently attached to the supramolecular network. These materials showed healing of scratches with light-irradiation, as long as the overlap of material absorbance and laser excitation was sufficient. Differences in the efficiency and rate of photohealing were observed, depending on the type of supramolecular interaction, and these were attributed to the differences in the thermal response of the materials' moduli. Such results provide insight into how materials can be designed with chromophores and supramolecular bonding interactions to tune the light-healing efficiency of the materials. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018.