Synthesis of single component element‐block materials based on siloxane‐based cage frameworks

Abstract

This mini-review focuses on recent efforts to prepare single component element-block materials based on siloxane-based cage frameworks, a promising approach to control the sequence of organic and inorganic segments in organic-inorganic hybrids at the molecular level. Polyhedral octasilsesquioxanes, denoted (RSiO 1.5 ) 8 or labeled T 8 cages, and octadimethylsiloxy-Q 8 cages, denoted (RSiMe 2 OSiO 1.5 ) 8 , are used here as siloxane-based cage frameworks. Thermoplastic optically transparent silsesquioxane materials derived from a single cage compound can be obtained with dumbbell-and star-shaped cage structures, allowing precise design of their structures for tuning properties. The siloxane-based cage core dendrimers are ideal candidates for single component element-block materials which possess three-dimensional, well-defined molecular level structures. Their rigid and cubic inorganic frameworks provide unique features for siloxane-based cage core dendrimers. These topics attract attention in both academia and industry.

Synthesis of Monofunctionalized Silsesquioxanes (RSiMe2O)(iBu)7Si8O12via Alkene Hydrosilylation

“…Unique structure andp roperties make POSS popular in many areas of applications, primarily in the synthesis of advanced, well-defined, highly functionalized, hybrid materials. [1] Among various types of POSS, one of the most widespread is the cubic-octameric framework, with as ingler eactive group and seven inert ones (R'R 7 Si 9 O 12 ). Such systems have been obtained via condensation of trisilanols (R 7 Si 7 O 9 (OH) 3 )w ith functionalized silanes (e.g.…”

“…Thus, we decidedt oe xamine the hydrosilylation of aw ide range of functional alkenes with silsesquioxane (HSi-Me 2 O)(iBu) 7 Si 8 O 12 (1), control the processes with the 1 H, 13 C, 29 Si NMR and in situ FTIR, and determine the influence of the type of catalyst, reactiont emperature and time on the effectiveness of the process. The final objective was to fully characterize the obtainedp ost-reaction mixtures and isolated products.…”

Fe3O4 nanoparticles coated with polyhedral oligomeric silsesquioxanes and β‐cyclodextrin for magnetic solid‐phase extraction of carbaryl and carbofuran

“…Polyhedral oligomeric silsesquioxanes (POSS) are unique 3D nanobuilding blocks with a well‐defined cage‐like structure which consists of silicon and oxygen atoms linked together in a cubic structure [33,34]. POSS can be used as precursors to enhance the mechanical and thermal stability of the resulting POSS‐containing nanohybrid polymers for the unique cage‐like structures and nanoscale dimensions [35].…”

Fabrication of composite films with poly(methyl methacrylate) and incompletely condensed cage‐silsesquioxane fillers

“…To control the properties of such materials, fillers are often utilized: for example, thermal stability, mechanical properties, refractive index (RI), hydrophobicity, and advanced functions. [1][2][3][4] Polyhedral oligomeric silsesquioxane (POSS) [5][6][7][8][9][10][11][12] has attracted much attention as a nanofiller [13][14][15][16][17][18][19][20] because it has not only high transparency and thermal stability due to the inorganic core but also fine designability and good solubility due to the organic substituents. Films of polymer-POSS composites can be easily fabricated, and various properties are improved and/or tuned.…”