ABSTRACT Optically clear pressure‐sensitive adhesives for foldable optical devices require a balanced combination of adhesion, optical transparency, creep resistance, and bending durability. In this work, a semi‐interpenetrating network organogel OPSA, was designed and prepared to improve the dynamic bonding stability under repeated deformation. A ureido‐containing polar acrylate monomer was first synthesized from 2‐isocyanatoethyl methacrylate and butylamine, and then copolymerized with 2‐ethylhexyl acrylate and acrylic acid to obtain linear polyacrylate (PA‐1). Meanwhile, a cross‐linked network (PA‐2) was constructed by photopolymerization of a polypropylene glycol‐based polyurethane acrylate flexible cross‐linker (PUA), 2‐ethylhexyl acrylate, and hydroxyethyl acrylate. The final OPSA was formed by combining PA‐1, PA‐2, and 1,5‐pentanediol as a polar small molecule. In this system, the semi‐interpenetrating network formed by PA‐1 and PA‐2 improves elastic recovery and creep resistance, while 1,5‐pentanediol introduces abundant reversible hydrogen‐bonding interactions, thereby enhancing stress dissipation during bending. The optimized OPSA containing 10 wt.% 1,5‐pentanediol exhibits the best overall performance, including a 180° peel strength of 12.5 N/25 mm, recovery efficiency above 93%, transmittance of 92.3%, haze of only 0.22%, and excellent folding durability over 300 000 cycles. These results demonstrate that combining a flexible semi‐interpenetrating network with reversible hydrogen‐bonding interactions is an effective strategy for developing high‐performance OPSAs for dynamic optical devices.
Min et al. (Tue,) studied this question.