Versatile Approach to Building Dynamic Covalent Polymer Networks by Stimulating the Dormant Groups

Area of Science:

• Polymer Chemistry
• Materials Science
• Organic Chemistry

Background:

• Developing versatile reversible cross-linking methods for polymers remains a challenge.
• Existing methods often lack broad applicability to common polymers.

Purpose of the Study:

• To introduce a general approach for creating dynamic covalent networks in polymers containing C-H bonds.
• To enable thermal reversible cross-linking for polymer remodeling and self-healing.

Main Methods:

• Utilizing benzophenone (BP) to abstract hydrogen from polymer C-H bonds under UV irradiation, forming dormant diarylsemipinacol (DASP) groups.
• Inducing homolytic cleavage of DASP linkages upon heating to generate radicals, facilitating network rearrangement.

Main Results:

• Successfully formed dynamic covalent networks in polymers with aliphatic C-H bonds.
• Demonstrated that the DASP-based linkages enable thermal reversible cross-linking.
• Achieved polymer network remodeling and self-healing capabilities.

Conclusions:

• The developed BP-initiated method provides a versatile and general strategy for creating thermally reversible cross-linked polymer networks.
• This approach offers significant potential for applications requiring adaptable and repairable polymer materials.