Photo-modulated activation of organic bases enabling microencapsulation and on-demand reactivity

Wenle Li (), Xiaocun Lu, Jacob M. Diamond, Chengtian Shen, Bo Jiang, Shi Sun, Jeffrey S. Moore and Nancy R. Sottos ()
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Wenle Li: China University of Petroleum (East China)
Xiaocun Lu: Clarkson University
Jacob M. Diamond: University of Illinois at Urbana-Champaign
Chengtian Shen: University of Illinois at Urbana-Champaign
Bo Jiang: China University of Petroleum (East China)
Shi Sun: China University of Petroleum (East China)
Jeffrey S. Moore: University of Illinois at Urbana-Champaign
Nancy R. Sottos: University of Illinois at Urbana-Champaign

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract A method is developed for facile encapsulation of reactive organic bases with potential application for autonomous damage detection and self-healing polymers. Highly reactive chemicals such as bases and acids are challenging to encapsulate by traditional oil-water emulsion techniques due to unfavorable physical and chemical interactions. In this work, reactivity of the bases is temporarily masked with photo-removable protecting groups, and the resulting inactive payloads are encapsulated via an in situ emulsion-templated interfacial polymerization method. The encapsulated payloads are then activated to restore the organic bases via photo irradiation, either before or after being released from the core-shell carriers. The efficacy of the photo-activated capsules is demonstrated by a damage-triggered, pH-induced color change in polymeric coatings and by recovery of adhesive strength of a damaged interface. Given the wide range of potential photo-deprotection chemistries, this encapsulation scheme provides a simple but powerful method for storage and targeted delivery of a broad variety of reactive chemicals, promoting design of diverse autonomous functionalities in polymeric materials.

Date: 2024
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DOI: 10.1038/s41467-024-47175-x

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