Photo-Tunable Elastomers Enabling Reversible, Broad-Range Modulation of Mechanical Properties Via Dynamic Covalent...

Area of Science:

• Materials Science
• Polymer Chemistry
• Photochemistry

Background:

• Light-responsive materials are crucial for tunable functionalities.
• Existing photo-responsive materials have limitations in mechanical performance and tunability.

Purpose of the Study:

• To develop a novel photo-tunable elastomer with improved mechanical properties and a broader tunable range.
• To investigate the use of selenosulfide-based dynamic covalent crosslinkers for light-induced property modulation.

Main Methods:

• Incorporation of urethane acrylate network with selenosulfide dynamic covalent crosslinkers.
• Utilizing selenosulfide photo-metathesis triggered by ultraviolet and visible light.
• Modeling crosslinking density changes and predicting modulus variation based on reaction kinetics.

Main Results:

• Achieved high tensile strength (>1.2 MPa) and a tunable Young's modulus range of 0.8 MPa.
• Demonstrated fine control over modulus, strength, and stretchability via light exposure.
• Enabled localized mechanical adjustments, transformable multi-material structures, and enhanced fracture resistance.

Conclusions:

• The developed photo-tunable elastomer offers superior mechanical performance and a wide tunable range.
• The selenosulfide dynamic covalent crosslinker strategy provides a versatile platform for creating various photo-tunable elastomers and gels.
• This approach enables precise, light-induced control over material properties for advanced applications.