Versatile tensile and fracture behaviors of dual cross-linked elastomers by postpreparation photo tuning of local cross-link density

Digital Photopatterning: Designing Functional Multipolymeric Patterning Films

“…The UV irradiation through photomasks enabled the area-selective cross-linking, resulting in the film with a patterned modulus. Similarly, our group reported the preparation of the film with modulus patterning based on the area-selective photo-cross-linking, demonstrating restriction of crack propagation during the uniaxial loading . As an example of area-selective photopolymerization, Kumachev reported the preparation of functional gels with stripe patterning structures, where the photopolymerization was applied through photomasks .…”

“…Similarly, our group reported the preparation of the film with modulus patterning based on the area-selective photo-cross-linking, demonstrating restriction of crack propagation during the uniaxial loading. 15 As an example of areaselective photopolymerization, Kumachev reported the preparation of functional gels with stripe patterning structures, where the photopolymerization was applied through photomasks. 16 More recently, not only single polymerization but also area-selective two-step polymerization was reported by incorporating special chromophores with different absorbance wavelengths, 17,18 enabling the patterning of different polymers in each polymerization step.…”

Rugged Island-Bridge Inorganic Electronics Mounted on Locally Strain-Isolated Substrates

“…However, programmable rigidity can lead to loss of stretchability because of the possibility of continuous crosslinking by external stimuli (such as heat or light). 48,49 Furthermore, a sufficient strain-isolation effect is difficult in programmed rigidity owing to the limitation in suitably increasing the inherent low-modulus properties of siliconbased polymers. 50−54 Therefore, to realize stretchable electronics, it is imperative to go beyond merely employing strain isolation strategies.…”

Macroscopic Property Evaluation of Titania Nanocomposite Polymer Capable of Drawing Double-Network Macrostructure Using Photolithography

“…10 Furthermore, Sugimoto et al reported that by designing heat-cross-linking and photo-cross-linking parts, an increase in the Young's modulus by more than 2 orders of magnitude was achieved by performing a photo-cross-linking process after a normal elastomer manufacturing heat process. 11 As an exciting point of this research, the conversion of crosslinked microstructures into macroblock structures was demonstrated to improve their mechanical properties.…”

“…The modular patterning of films using photoreactions can add cross-linking points after deposition. − For example, Clet et al demonstrated a precise microscale patterning to modify the modulus of silicone elastomers . Furthermore, Sugimoto et al reported that by designing heat-cross-linking and photo-cross-linking parts, an increase in the Young’s modulus by more than 2 orders of magnitude was achieved by performing a photo-cross-linking process after a normal elastomer manufacturing heat process . As an exciting point of this research, the conversion of cross-linked microstructures into macroblock structures was demonstrated to improve their mechanical properties.…”