Molecular-level design of excellent reversible thermochromic polydiacetylene materials with the simultaneous enhancement of multiple performances,Materials Chemistry Frontiers

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Molecular-level design of excellent reversible thermochromic polydiacetylene materials with the simultaneous enhancement of multiple performances
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2021-08-05 , DOI: 10.1039/d1qm00721a
Wenjie Dong _{1,

2} , Renzhe Zhang ₁ , Guanhua Lin _{1,

3}

Affiliation

Recently, colorimetrically reversible materials have been paid significant attention not only to gain a better understanding of the fundamentals of their chromism but also to create ways to overcome the limitations associated with their colorimetrically irreversible counterparts. Generally, the properties of polydiacetylene (PDA)-based supramolecular materials strongly depend on their molecular packing structures, and the blue-colored PDAs undergo a color change to red when they are exposed to various stimuli. To achieve the reversible structural transition, we rationally designed a new L-Glu (L-glutamic acid)-derivatized diacetylene (DA–Glu) monomer to enhance the hydrogen-bonding interactions. Then, we developed a method to fabricate PDA–Glu/PDMS films, which could be readily obtained by mixing the PDMS precursor with the DA–Glu monomers, curing at an optimal temperature, and subjecting to UV irradiation. The prepared PDA–Glu/PDMS film showed excellent reversible thermochromism property when the temperature changed from 20 to 80 °C. Deep investigations revealed that the reversible thermochromism behavior could be attributed to the enhanced hydrogen-bonding interactions and the formation of a network structure in the PDA–Glu/PDMS film, which provided sufficient recovery force and free space for the PDA–Glu structures to reversibly vary with temperature. Further studies demonstrated that the formation of unique network structures did not only endow the PDA–Glu/PDMS film with excellent reversible thermochromism property, but also with good thermal stability and mechanical property. We believe that combining the waterproof property and other advanced properties of PDMS, the prepared PDA–Glu/PDMS films would present very promising applications in many fields. Our research opens a new way to improve the performance of materials and bestow them with novel properties by modifying the monomers at the molecular level.

中文翻译：

优异的可逆热致变色聚丁二炔材料的分子级设计，同时增强多种性能

最近，比色可逆材料受到了极大的关注，不仅是为了更好地了解其变色的基本原理，而且是为了创造克服与其比色不可逆对应物相关的局限性的方法。通常，基于聚二乙炔 (PDA) 的超分子材料的性质在很大程度上取决于它们的分子堆积结构，而蓝色的 PDAs 在受到各种刺激时会发生颜色变化为红色。为了实现可逆的结构转变，我们合理设计了一种新的L -Glu（L-谷氨酸）衍生的丁二炔（DA-Glu）单体以增强氢键相互作用。然后，我们开发了一种制备 PDA-Glu/PDMS 薄膜的方法，该方法可以通过将 PDMS 前体与 DA-Glu 单体混合、在最佳温度下固化并进行紫外线照射来轻松获得。制备的 PDA-Glu/PDMS 薄膜在温度从 20°C 变为 80°C 时表现出优异的可逆热致变色性能。深入研究表明，可逆热致变色行为可归因于增强的氢键相互作用和 PDA-Glu/PDMS 膜中网络结构的形成，这为 PDA-Glu 结构的可逆恢复提供了足够的恢复力和自由空间。随温度变化。进一步的研究表明，独特的网络结构的形成不仅赋予了 PDA-Glu/PDMS 薄膜优异的可逆热致变色性能，而且还具有良好的热稳定性和机械性能。我们相信，结合 PDMS 的防水性能和其他先进性能，制备的 PDA-Glu/PDMS 薄膜将在许多领域呈现出非常有前景的应用。我们的研究开辟了一种通过在分子水平上修饰单体来提高材料性能并赋予其新特性的新方法。制备的 PDA-Glu/PDMS 薄膜将在许多领域呈现出非常有前景的应用。我们的研究开辟了一种通过在分子水平上修饰单体来提高材料性能并赋予其新特性的新方法。制备的 PDA-Glu/PDMS 薄膜将在许多领域呈现出非常有前景的应用。我们的研究开辟了一种通过在分子水平上修饰单体来提高材料性能并赋予其新特性的新方法。

更新日期：2021-08-19

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