POS4-0670
Smart Adhesive Incorporating Visible-Light-Driven Photoswitches for Micro-Spatially Controllable and Efficient On-Demand Debonding
Topic
S4. Colloids, Interfaces, and Molecular Assemblies for Functional Soft Materials
When and Where
Sep 29, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Hae Jung SON
Boseok KANG
Presenter(s)
Minkyeong Gwon (Pusan National University)
Co-Author(s)
Abstract
On-demand debonding adhesives are essential for advanced applications including heterogeneous integration, temporary wafer bonding, and soft robotic grippers. While conventional UV-responsive adhesives suffer from limited tackiness tuning ranges due to subtle molecular changes and UV-induced photodamage, visible-light-driven Donor-Acceptor Stenhouse Adduct(DASA) photoswitches offer a promising alternative. They undergo a transition between open and closed isomeric forms, leading to substantial alterations in molecular volume and polarity that translate into effective modulation of macroscopic adhesion performance.
We report a visible-light-responsive adhesive by covalently integrating DASA moieties into a polyethyleneimine(PEI)-based crosslinked network, allowing molecular-scale photoisomerization to propagate through the network for macroscopically tunable adhesion. To quantify adhesion strength against PDMS, probe tack tests with PDMS probe were conducted. Visible-light-induced open-to-closed DASA isomerization significantly altered the bulk properties, leading to an approximately 107℃ 
decrease in the glass transition temperature and a reduction in storage modulus. In addition, although the total surface energy increased after photoisomerization, the dispersive component which primarily dictates interfacial interactions with PDMS decreased substantially. Consequently, visible-light irradiation diminished tackiness by up to 67.68% in the optimized formulation, demonstrating that switchable adhesion is governed by the simultaneous modulation of bulk mechanics and surface properties. Furthermore, this system enables localized adhesion control at the several-hundred-micrometer scale using a photomask, while exhibiting ambient stability, retaining performance for over 14 days while achieving complete detachment within 1 minute upon irradiation. Overall, our platform offers a promising pathway toward highly efficient and spatially controllable smart adhesives.
We report a visible-light-responsive adhesive by covalently integrating DASA moieties into a polyethyleneimine(PEI)-based crosslinked network, allowing molecular-scale photoisomerization to propagate through the network for macroscopically tunable adhesion. To quantify adhesion strength against PDMS, probe tack tests with PDMS probe were conducted. Visible-light-induced open-to-closed DASA isomerization significantly altered the bulk properties, leading to an approximately 107
