A Mortise-and-Tenon Joint Inspired Mechanically Interlocked Network.

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Mechanical Engineering

Background:

• Mortise-and-tenon joints are ancient, effective structural connectors in woodworking.
• Replicating their mechanical principles in synthetic materials at the molecular level presents a significant challenge.
• Designing materials with both adaptability and stability is crucial for advanced applications.

Purpose of the Study:

• To develop a mechanically interlocked network (MIN) inspired by the mortise-and-tenon joint.
• To investigate the structure-property relationships of this novel MIN.
• To achieve simultaneous mechanical adaptivity and structural stability in a single material system.

Main Methods:

• Synthesis of a mechanically interlocked network utilizing [2]rotaxane crosslinks.
• Structural characterization of the synthesized MIN.
• Mechanical testing to evaluate stiffness, strength, toughness, and deformation recovery.

Main Results:

• The [2]rotaxane crosslink successfully mimics the structural and functional aspects of mortise-and-tenon joints.
• The MIN demonstrates hierarchical energy dissipation through controllable intramolecular movement.
• The material exhibits a unique combination of high stiffness, strength, toughness, and excellent deformation recovery.

Conclusions:

• The mortise-and-tenon inspired MIN offers a new paradigm for designing adaptive materials.
• This approach successfully integrates mechanical adaptivity and structural stability.
• The findings pave the way for developing advanced materials with tunable mechanical properties.