Photocured Materials with Self-Healing Function through Ionic Interactions for Flexible Electronics

Abstract

Photocured materials with self-healing function have the merit of long lifetime and environmentally benign preparation process and thus find potential applications in various fields. Herein, a novel imidazolium-containing photocurable monomer, (6-(3-(3(2-hydroxyethyl)-1 H-imidazol-3-ium bromide)propanoyloxy)hexyl acrylate, IM-A), was designed and synthesized. Self-healing polymers were prepared by fast photocuring with IM-A, isobornyl acrylate, 2-(2-ethoxyethoxy)ethyl acrylate, and 2-hydroxyethyl acrylate as the monomers. The mechanical and self-healing properties of the polymers were tuned by varying the contents of IM-A and other monomers. The as-prepared self-healing polymer IB7-IM5 exhibited a tensile strength of 3.1 MPa, elongation at break of 205%, healing efficiency of 93%, and a wide healing temperature range from room temperature to 120 °C. The self-healing polymer was also employed as a flexible substrate to fabricate a flexible electronic device, which could be healed and completely restore its conductivity after the device was damaged.

Influence of UV Polymerization Curing Conditions on Performance of Acrylic Pressure Sensitive Adhesives

“…As shown in Figure 3, the G' values of the fast-and slow-cured samples were monitored over time during UV irradiation, and their curves exhibited different tendencies because the reaction rates of acrylic monomers differ in UV polymerization. [30][31][32][33] To analyze these results quantitatively, we examined G'-G" crossover time, as that signified the point at which liquid-like behavior changed to solidlike behavior. The G'-G" crossover time of the slow-cured samples was longer than that of the fast-cured samples, implying that high UV intensity facilitated the formation of crosslinking structures.…”

Lanthanide‐Doped Nanoparticles for Near‐Infrared Light Activation of Photopolymerization: Fundamentals, Optimization and Applications

“…Compared with conventional thermal‐induced polymerization, [3] photopolymerization has demonstrated several unique advantages, including fast reaction rate, low polymerization temperature, low energy consumption, etc [1] . Therefore, photopolymerization has been widely used in printed inks, [4] electronics, [5] industrial coating, [6] digital storage, [7] 3D printing, [8] biomedicine, [9] etc. Traditional photopolymerization is commonly initiated by ultraviolet (UV) or visible light, which, however, has limited penetration depth in organic materials or biological materials [10] .…”

Advances in self-healing supramolecular soft materials and nanocomposites

“…In contrast, intrinsic self-healing based on supramolecular interaction is able to achieve autonomic self-healing. In general, these supramolecular interactions refer to reversible noncovalent bonds such as H-bonding [26], ionic interactions [27], metal–ligand coordination [28], host–guest interaction [28], and π–π stacking or hydrophobic interactions [29]. The basic self-healing chemistries are depicted in Fig.…”