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A Visible-Light-Induced Dynamic Mechanical Bond as a Linkage for Dynamic Materials
Yong-Fei Yin1, Meng-Yan Yun1, Lin Wu1
1Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Science, Zhejiang Normal University, 688 Yingbin Road, Jinhua, 321004, P. R. China.
Angewandte Chemie (International Ed. in English)
|July 13, 2019
Summary
Researchers developed a novel photoinduced dynamic mechanical bond (DMB) using [2]rotaxane. This visible-light-triggered bond allows reversible in-situ reforming without dynamic chemical bonds, enabling new dynamic soft materials.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Polymer Chemistry
Background:
- Dynamic bonds are crucial for creating adaptable materials.
- Conventional dynamic bonds often rely on chemical reactions.
- Photoresponsive systems offer unique control mechanisms.
Purpose of the Study:
- To introduce a new photoinduced [2]rotaxane-based dynamic mechanical bond (DMB).
- To demonstrate visible-light-triggered reversible formation and breaking of mechanical bonds.
- To explore the application of this DMB in designing dynamic soft materials.
Main Methods:
- Synthesis of a [2]rotaxane incorporating a photoisomerizable ortho-fluoroazobenzene unit.
- Utilizing visible light to induce isomerization and control macrocycle threading/unthreading.
- Fabrication of DMB-cross-linked polymeric gels.
Main Results:
- The DMB exhibits visible-light-triggered dynamic bonding behavior distinct from chemical bonds.
- Reversible in-situ de-/reforming of the mechanical bond was achieved without dynamic chemical linkages.
- DMB-cross-linked gels showed photoinduced degradation upon visible light irradiation.
Conclusions:
- The photoinduced DMB offers a novel approach to mechanical bond manipulation.
- This DMB system possesses dual dynamic characteristics: reversible bonding and mechanical interlocking.
- The DMB is a promising building block for advanced dynamic soft materials.
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