Citric acid-induced room temperature self-healing polysiloxane elastomers with tunable mechanical properties and untraditional AIE fluorescence

Abstract

Polysiloxane plays an irreplaceable role in aviation, automobile, flexible electronic devices, electrical engineering, etc. However, the poor mechanical strength makes it prone to damage in the working process. Therefore, it...

A super-tough and self-healing biomimetic luminescent elastomer enabled by hydrogen bonding arrays and lanthanide-bipyridine moieties

“…2d, ESI †). 4,[15][16][17][18][29][30][31][32][33][34][35][36][37][38] The stress and toughness of the obtained APU-Bpy 0.1 -Ln product are still superior to those of the super-strong and ultra-tough self-healing non-luminescent elastomers reported previously (Fig. 2e and Table S5, ESI †).…”

High-toughness, extensile and self-healing PDMS elastomers constructed by decuple hydrogen bonding

“…4d, the repair efficiency increased with the extended healing time. After healing for 24 h, the healing efficiency reached E100%, revealing excellent self-healing 31,36,39,44,57,[62][63][64][65][66][67][68] capability. There is no doubt that the rising repair temperature and time can promote the diffusion of polymer chains at the fracture interface and the activity of dynamic bonds, which is beneficial to self-healing.…”

“…33 Strong covalent crosslinking enhances the strength of the material but correspondingly reduces the toughness. The sacrificial bonds are introduced in the elastomer to achieve the effect of toughening, such as hydrogen bonds, [34][35][36][37] metal coordination bonds, 29,[38][39][40][41] p-p stacking interactions. [42][43][44] The preferential fracture of sacrificial bonds during stretching can dissipate the energy of stress.…”

“…In order to regulate the advantages and disadvantages between the strength, toughness, and tensile properties of the elastomers, multiple dynamic strong hydrogen bonds have been applied, such as double, 34,45 triple, 46 quadruple, 31,36,47 sextuple, 48,49 and even octuple 35 hydrogen bonding. The strength of multiple hydrogen bonds can enhance the tensile strength of materials and dissipate energy effectively.…”

Preparation and Applications of Polydimethylsiloxane‐Based Fluorescent Materials

“…employed citric acid (CA) and NH 2 -PDMS-NH 2 to copolymerize, producing amide group with unconventional blue fluorescence emission through general amidation reaction. [44] The cooperation of various types of hydrogen bonds in the system led to a dynamic cross-linking network, which facilitated the material to possess excellent ductility and self-healing properties. Liang et al connected PDMS with amine pendant groups (AP-PDMS) and aryl-boroxine via amidation reaction to contitute a dynamic crosslinking network.…”