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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Contact-dependent Signaling01:19

Contact-dependent Signaling

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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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移動型架橋点を有する共有結合性適応ネットワーク

Li Yang1, Wenbin Wang1, Yuanhao Wang1

  • 1State Key Laboratory of Synergistic Chem-Bio Synthesis, Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China.

Angewandte Chemie (International ed. in English)
|December 19, 2025
PubMed
まとめ

移動型動的架橋点を有するポリロタキサンベースの共有結合性適応ネットワーク（PRCAN）を開発した。これらのPRCANは、従来のCANと比較して、優れた機械的特性と大幅に低い加工温度を提供する。

キーワード:
共有結合性適応ネットワーク動的ホウ酸エステル結合主鎖ポリロタキサン移動型架橋点再加工性

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関連する実験動画

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Design and Synthesis of a Reconfigurable DNA Accordion Rack
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科学分野:

  • 材料科学
  • 高分子化学
  • 持続可能な材料

背景:

  • 共有結合性適応ネットワーク（CAN）は持続可能な材料として有望であるが、加工性と機械的性能のバランスを取るという課題に直面している。
  • 既存のCANは、高い加工温度を必要とし、機械的耐久性が限定的であることが多い。

研究 の 目的:

  • 移動型動的架橋点を利用した新しいクラスのポリロタキサンベースCAN（PRCAN）を導入する。
  • 移動型動的架橋がCANの機械的特性と加工温度にどのように影響するかを調査する。

主な方法:

  • 動的ホウ酸エステル結合を有する機械的にインターロックされた車軸を備えたPRCANを合成した。
  • PRCANの機械的性能（破壊伸び、引張強度、靭性）と再加工特性を、架橋点が固定された対照サンプルと比較した。

主要な成果:

  • PRCANは、対照群と比較して、破壊伸びと引張強度が2倍、靭性が4倍以上向上し、著しく強化された機械的性能を示した。
  • PRCANの移動型架橋点は、対照群（30分で140°C）と比較して、必要な加工温度（10分で110°C）を低下させた。
  • PRCANの移動型動的共有結合は、応力下での効率的なエネルギー散逸を促進する。

結論:

  • 移動型動的架橋を有するポリロタキサンベースCANは、従来のCANの限界を克服するための実行可能な戦略を提供する。
  • PRCANは、高性能で加工しやすく持続可能な材料を開発するための新しいプラットフォームを提示する。