Authors
Huaming Wang, Xianyan Shen, Changling Du, Xian-You Liu, Anyu Yang, Yanni Cao, Aijie Han, Qihan Liu, Jennifer Laaser, Wei Zhang
Published in
Advanced science (Weinheim, Baden-Wurttemberg, Germany). Pages e07809. Aug 04, 2025. Epub Aug 04, 2025.
Abstract
Removable adhesives with controllable bonding and debonding capabilities are essential for biomedical devices, temporary fixation, and recyclable materials. Here, a dual-wavelength hydrogel glue is presented that integrates visible-light polymerization (470 nm) for strong adhesion and UV-induced degradation (365 nm) for rapid debonding. The system leverages camphorquinone as a visible-light photoinitiator and ortho-nitrobenzyl poly(ethylene glycol) dimethacrylate (ONB-PEGDMA) as a UV-cleavable crosslinker, ensuring independent control over adhesion and detachment with orthogonal polymerization and degradation. The degradation rate of ONB-PEGDMA increases proportionally with light intensity, providing precise control over cleavage kinetics, with first-order rate constants of 0.155, 0.278, and 0.669 min-1 for 20, 50, and 100 mW cm- 2, respectively. The hydrogel exhibits strong adhesion (≈200 kPa) and undergoes a fourfold reduction in adhesion strength within 90 s of 365 nm irradiation at 100 mW cm- 2 under a constant tensile load of 10 N, enabling efficient removal. Rheological analysis confirms a significant decrease in storage modulus and crosslinking density after UV exposure, leading to network softening and structural failure. This work pioneers a phototunable hydrogel glue that bridges photopolymerization and photodegradation, offering a promising platform for next-generation adhesives with precise spatiotemporal control and with easy application, good bonding, and rapid UV-triggered debonding.
PMID:
40755361
Bibliographic data and abstract were imported from PubMed on 04 Aug 2025.
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