4.8 Article

Covalent Organic Frameworks as Efficient Photoinitiators and Cross-Linkers To Fabricate Highly Stretchable Hydrogels

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 43, Pages 49254-49263

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c17114

Keywords

hydrogel; photopolymerization; photocatalysts; photoinitiators; fluorescence

Funding

  1. National Natural Science Foundation of China [51873019, 51973016]

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This work demonstrates the use of imine-type covalent organic framework nanoparticles as efficient photocatalytic initiators, without the need for a co-initiator, to prepare multifunctional hydrogels under visible light. The hydrogels exhibit high stretchability and mechanical properties, as well as promising fluorescence features.
In this work, two kinds of imine-type covalent organic framework (COF) nanoparticles are demonstrated as efficient photocatalytic initiators to trigger the free-radical polymerization of acrylamide (AM) to prepare polyacrylamide (PAM) hydrogels under visible light irradiation, without any assistance from the co-initiator. Simultaneously, the COF nanoparticles bearing vinyl side groups (COF-V) promote covalent cross-linking of the polymer chains, which significantly reinforces the mechanical properties of the nanocomposite hydrogel. The obtained PAM/ COF-V hydrogel is highly stretchable with an extraordinary elongation up to 3300% strain. On the other hand, the COF nanoparticles modified with methoxy moieties (COF-OMe) endow the resulting PAM/ COF-OMe hydrogel with a promising fluorescence feature. In addition, this strategy provides a visible-light-regulated photocatalytic polymerization approach with a simplified recipe to fabricate COF-based nanocomposite hydrogels or resins with diverse functions.

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