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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Network reorganization in cross-linked polymer/silica composites based on exchangeable dynamic covalent carbon-carbon bonds
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Network reorganization in cross-linked polymer/silica composites based on exchangeable dynamic covalent carbon-carbon bonds

机译：基于可交换动态共价碳键的交联聚合物/二氧化硅复合材料中的网络重组

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摘要

Diarylbibenzofuranone (DABBF), which contains an exchangeable dynamic covalent carbon-carbon bond was introduced into the polymer or silica domains of two series of polymer/silica composites with a network structure in order to investigate the correlation between the structural reorganization and the location of the DABBF units in these polymer/silica composites. The thermally induced structural reorganization behavior of the two polymer/silica composites was investigated by optical microscopy, dynamic mechanical analysis, and variable-temperature electron paramagnetic resonance spectroscopy. The thus obtained results revealed that the cross-linked polymer/silica composites that contain DABBF units in the polymer domain exhibit network reorganization, and that the efficiency of the network reorganization increases with the molecular weight between the cross-linking points composed of silica domains. Conversely, the cross-linked composite that contains the DABBF units in the silica domains does not show a network reorganization, as the densely cross-linked silica structure prevents the bond exchange reactions of the DABBF units. In their entirety, these results clearly indicate that the incorporation of dynamic covalent linkages in the high mobile polymer domain of cross-linked polymers is advantageous for structural reorganization, which affords a new guiding principle for the design of dynamic-covalent-chemistry-based materials.
机译：Diarylbibenzofuranone（DABBF），其中包含一个可更换的动态共价碳 - 碳键引入的与网络结构中的两个系列的聚合物/二氧化硅的复合材料的聚合物或二氧化硅域为了研究结构重组和的位置之间的相关性DABBF单元在这些聚合物/二氧化硅的复合材料。两种聚合物/二氧化硅复合材料的热引起的结构重组行为通过光学显微镜，动态力学分析，和电子顺磁共振光谱变温的影响。将这样得到的结果显示，该交联的聚合物/二氧化硅的复合材料包含在聚合物域表现出网络重组DABBF单元，而与二氧化硅结构域组成的交联点之间的分子量的网络重组的效率增大。相反地​​，包含于二氧化硅域DABBF单元交联的复合材料不表现出网络重组，作为密集的交联的二氧化硅结构防止DABBF单元的键的交换反应。以它们的整体，这些结果清楚地表明，在交联聚合物的高流动的聚合物域动态共价键的结合是一种用于结构重组，这提供一个新的指导原则为动态共价化学基材料的设计有利。

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