| 초록 |
The PSA, one of the adhesives, can be attached to various substrates by its nature (low Tg and high adhesion properties) without any phase change. Recently, detachability has been required to PSA for reworkability or device transfer. In some research, the phase change of polymer by heating or additional crosslinking was conducted for detachability. But the heating process can damage the substrate, and the additional crosslinking causes a permanent transition of the materials. In the current work, we studied reusable and photo-responsive PSA. The photo-responsive switchable PSA contains the azobenzene moiety in the polymer and additional monomer. When the azobenzene exists as a trans isomer, the surface of the PSA has no sticky property. But it can be changed to a sticky surface with photo-isomerization by UV and recovered with the trans transition by visible light. Furthermore, the photo-responsive switchable PSA can pick devices selectively by local UV irradiation. |
