POS1-0818
Rubbery OCR with High Clarity for Foldable Displays via In-Situ Photopolymerization
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Shin sangbin (Korea Research Institute of Chemical Technology)
Co-Author(s)
Abstract
With the rapid advancement of foldable display technologies, there is an increasing demand for optically clear resins (OCRs) that can simultaneously ensure low-temperature folding reliability and optical visibility of ultra-thin glass (UTG). In particular, a rubbery matrix with low modulus and efficient viscoelastic energy dissipation is essential for absorbing and distributing localized stress generated in the folding region. In this study, a urethane acrylate-based rubbery OCR was designed by incorporating hydroxyl-terminated polybutadiene (HTPB) as a soft segment, enabling excellent flexibility and deformation recovery under low-temperature conditions. However, the highly hydrophobic nature of HTPB-based polymers leads to poor interfacial wetting and weak adhesion to hydrophilic UTG substrates. To overcome this limitation, an MPS-assisted silanization treatment was introduced onto the UTG surface, forming a covalent bridging structure between the glass substrate and the photocured resin network. In addition, the relatively high refractive index originating from the unsaturated hydrocarbon structure of HTPB enabled effective refractive index matching with UTG, thereby reducing optical discontinuity and internal reflection at the interface. The resulting OCR maintained a soft modulus of 1–2 MPa even under low-temperature conditions (e.g., -20 °C) and exhibited strong adhesion reliability on silanized UTG without interfacial delamination. These results suggest that the HTPB-based rubbery OCR prepared via in situ photopolymerization is a promising optical bonding and reinforcement material for next-generation foldable display applications.
