Design, Exploitation, and Rational Improvements of Diazirine-Based Universal Polymer Crosslinkers

Area of Science:

• Materials Science
• Polymer Chemistry
• Organic Chemistry

Background:

• Traditional polymer crosslinking methods are substrate-specific, limiting the upgrade of many commodity thermoplastics.
• Existing technologies fail to address the crosslinking needs of polymers like polypropylene and polyhydroxyalkanoates.
• A universal approach to polymer crosslinking is needed to enhance material properties and enable new functionalities.

Purpose of the Study:

• To develop and characterize novel universal crosslinkers for aliphatic polymers.
• To demonstrate the broad applicability of these crosslinkers across various polymer types.
• To explore advanced applications including reprocessable thermosets, vitrimers, and surface modifications.

Main Methods:

• Leveraging trifluoromethyl aryl diazirine motifs for C-H insertion into aliphatic polymer chains.
• Synthesizing electronically optimized diazirines and developing cleavable crosslinker variants.
• Investigating structure-function relationships to enhance crosslinking efficiency.

Main Results:

• Developed the first universal crosslinkers effective for a wide range of aliphatic polymers, including challenging substrates like polypropylene.
• Achieved >10-fold improvement in crosslinking efficiency through structure optimization.
• Demonstrated applications in photopatterning, adhesion, reprocessable thermosets, vitrimers, and enhancing perovskite solar cell stability.

Conclusions:

• Trifluoromethyl aryl diazirine-based crosslinkers provide a versatile and powerful platform for polymer modification.
• This technology overcomes limitations of traditional crosslinking, enabling property enhancement and novel material design.
• The field has seen rapid growth, with significant potential in microelectronics, coatings, composites, and biomedical applications.