Organic–Inorganic Polyimides with POSS Cages in the Main Chains: An Impact of POSS R Groups on Morphologies and Properties

Abstract

Two well-defined POSS diamines were synthesized with phenyl (Ph) and iso-butyl (i-Bu) POSS trisilanols as the starting compounds. This approach involves the protection and deprotection of silanol hydroxyl groups with phenylboronic acid and pinacol, followed by the silylation of silanol hydroxyl groups with mono- and dichlorosilanes. With this route of synthesis, two well-defined divinyl POSS macromers were obtained, as evidenced by 1H, 29Si NMR, and mass spectroscopy. These two divinyl POSS macromers were further functionalized into well-defined POSS diamines via the Heck reaction with p-bromoaniline. The successful synthesis of POSS diamines enabled the synthesis of organic–inorganic polyimides with the POSS cages in the main chains. More importantly, the syntheses of these two POSS diamines allowed the examination of the effect of POSS R groups (i.e., Ph and i-Bu) on the morphologies and thermomechanical and dielectric properties of organic–inorganic polyimides. Notably, the types of POSS R groups exerted a profound impact on the morphologies and properties of the organic–inorganic polyimides.

AB-type monomer of polyhedral oligomeric silsesquioxane

“…14 Although an A 2 -type monomer based on CO-POSS capped by dichloromethylvinylsilane was recently reported, the coexistence of isomers has not been discussed. 15 The model reaction was conducted at varying concentrations of 1 ([ 1 ] = 13 and 40 mM). Under dilute conditions ([ 1 ] = 13 mM), the target compound ( 2 ) was obtained in moderate yield (81%) only by extraction ( n -hexane/H 2 O) and drying.…”

Double-Layer Superhydrophobic Coating: Enhanced Anti-Corrosion and Anti-Fouling Resistance through Star Cross-linking of FPI/POSS@POA/F-SiO 2

“…Polyhedral oligomeric sesquioxanes (POSS) have been extensively served as foundational components in the construction of nanocomposites [30], which is attributed to their precisely de ned stereomolecular structure, low surface energy, chemical stability, and easily modi able surface properties [31,32]. Rezaei et al [33] utilized the distinctive stereostructure of POSS as a scaffold for TiO 2 nanoparticles, resulting in a polymer-based superhydrophobic nanocomposite surface characterized by a unique layered morphology.…”