A Group-Enriched Viscoelastic Model for High-Damping Vitrimers with Many Dangling Chains

Area of Science:

• Materials Science
• Polymer Chemistry
• Rheology

Background:

• Classical viscoelastic models often fail to capture complex behaviors in self-healing vitrimers due to their limited scope, primarily considering chain segment and whole chain motion.
• Vitrimer materials, particularly those designed for damping applications, exhibit significant group movements that are crucial for their performance but are neglected in traditional models.

Purpose of the Study:

• To develop and validate a "group-enriched" viscoelastic model capable of accurately describing the behavior of self-healing vitrimers where group effects are prominent.
• To synthesize a novel damping vitrimer with numerous dangling chains to enhance damping properties and highlight the importance of group effects.

Main Methods:

• Synthesis of a damping vitrimer featuring abundant dangling chains to increase damping capacity.
• Development of a group-enriched viscoelastic model incorporating the influence of group movements.
• Experimental characterization of the synthesized vitrimer's damping behavior and comparison with model predictions.

Main Results:

• The synthesized vitrimer demonstrated enhanced damping capabilities due to its dangling chains.
• The group-enriched viscoelastic model accurately captured the experimental damping behavior of the synthesized vitrimer.
• The model's accuracy significantly improved compared to classical viscoelastic models for this specific material.

Conclusions:

• The group-enriched viscoelastic model provides a more accurate representation of self-healing vitrimer dynamics, especially when group movements are significant.
• The influence of group effects on viscoelastic behavior is frequency and temperature-dependent, being negligible at low frequencies but significant at high frequencies or low temperatures.