Supramolecular organogel formation behaviors of beads-on-string shaped poly(azomethine)s dependent on POSS structures in the main chains

Abstract

Beads-on-string-shaped polymers incorporating cage silsesquioxanes in the main chain, especially double-decker-shaped phenyl-substituted silsesquioxanes (DDSQ), have received significant attention in the past few decades. Difunctionalized isobutyl-substituted cage octasilsesquioxane (T8) have slso...

Unsymmetric Dumbbell-Shaped Polyhedral Oligomeric Silsesquioxane (POSS) Compound as a Single-Component POSS Hybrid

“…This observation suggests that 4 iBu and 4 Ph were almost completely phase-separated during the mixing process. Indeed, 4 Ph was insoluble in hydrocarbons such as n -hexane and toluene, while 4 iBu was soluble in these solvents. , This was the first study on the compatibility of phenyl- and isobutyl-substituted POSS derivatives.…”

“…These observations are consistent with the results for phenyl-and isobutyl-substituted POSS derivatives. 19,20 The phenyl-substituted POSS compounds show limited solubility, only soluble in THF and insoluble in hydrocarbons such as n-hexane and toluene, while the isobutyl-substituted ones were soluble in these solvents. The unsymmetric dumbbell-shaped POSS (3 Ph-iBu ) was soluble in toluene but insoluble in n-hexane.…”

“…Indeed, 4 Ph was insoluble in hydrocarbons such as n-hexane and toluene, while 4 iBu was soluble in these solvents. 19,20 This was the first study on the compatibility of phenyl-and isobutylsubstituted POSS derivatives. DSC analysis of 3 iBu-iBu showed a sharp endothermic peak at 205 °C, of which enthalpy was 34.4 kJ/mol (Figure 3).…”

“…Solubility and compatibility of the POSS compounds are also dependent on their substituents. , Phenyl-substituted POSS compounds show limited solubility, only soluble in THF or chloroform and insoluble in hydrocarbons such as n -hexane and toluene, while isobutyl-substituted POSSs were soluble in these solvents, suggesting the latter is more compatible in polymer matrix than the former. It was reported that the introduction of phenyl-substituted POSS blocks at the end of organic polymers was more effective at reinforcing or reducing the mobility of the polymer chains than attaching isobutyl-substituted POSS blocks .…”

Soluble and processable thermoplastic hybrid polyimides containing POSS in main chains

“…As described above, the polymerization of 1 with 4a yielded a low-molecular-weight polymer, and its detailed polymer properties were not investigated. 36,37 Recently, we polymerized 1 with a dialdehyde monomer, which also yielded low-molecular-weight poly(azomethine)s. 39 Hence, we prepared 3,13-bis (3-aminopropyl)-DDSQ (3) (Fig. 1), in which the 4-aminophenyl groups in 1 were replaced with aminopropyl groups to increase nucleophilicity.…”