リバーシブルとイリバーシブルな反応を示すロタキサンベースの二重機能メカノフォール
Tatsuya Muramatsu1, Yuji Okado2, Hanna Traeger3
1Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
Journal of the American Chemical Society
|June 24, 2021
まとめ
新しいロタキサンメカノフォアはポリマーのための二重光学信号を提供します. これらの材料は,機械的なストレスで可逆的な光変化を示し,高圧で不可逆的な変化を示し,損傷の監視を可能にします.
科学分野:
- 超分子化学
- ポリマー科学
- 材料科学
背景:
- メカノクロームのメカノフォアはポリマーに 機械的な出来事を光学的にシグナルを与えます
- ロタキサンは 機械的に結合した分子で 高度な材料を設計する可能性を秘めています
研究 の 目的:
- リバーシブルと不可逆的な光変化を示す新しいロタキサンベースの超分子メカニコフォアを開発する.
- ポリマーの分子構造,機械力,光学反応の関係を調査する.
主な方法:
- ルミノフォアを運ぶリングと,軸にクエンチャーを搭載したロタキサン・メカニコフォアの合成.
- これらのロタキサンをポリウレタン (PU) エラストマーに組み込む.
- 異なる力およびストレスの条件下で光反応を評価するために,弾性物質の機械的試験.
主要な成果:
- ロタキサンメカノフォアは,適度な力による分子シャットリングによる可逆的な光スイッチングを示した.
- 高圧で不可逆的な光変化と永続的な光学信号が観察され,リングの脱線と機械的結合の破裂を引き起こした.
- これらのメカノフォールを含むポリウレタン弾性体は,適用された機械的刺激に対応する明確な可逆的および不可逆的な光学反応を示した.
結論:
- ロタキサン基の超分子メカニコフォーは,二重の,力依存の光学読み取り (可逆的および不可逆的) を提供するように設計することができます.
- 分子設計,特にリングとストッパー部分の選択は,この二重反応を達成するために重要です.
- これらの材料は,ポリマーの変形をリアルタイムで監視し,光学信号を通して過去の機械的損傷の記録を提供します.
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