Polyhedral Silsesquioxanes

Abstract

This chapter aims to highlight the selected applications of polyhedral oligomeric silsesquioxanes (POSS). A brief introduction will be given and used to highlight the use of solution-gelation chemistry for the synthesis of POSS. Furthermore, the different three-dimensional structures, including fully and incompletely condensed, random, and ladder structures, will be discussed. Subsequently, the use of the various POSS structures as fillers in polymeric nanocomposites will be examined, with a focus on polymer blends, pendant polymers, bead polymers,

Polysiloxanes Grafted with Mono(alkenyl)Silsesquioxanes—Particular Concept for Their Connection

“…Basing on the scientific literature and our experience, we selected two types of mono(alkenyl)substituted T 8 SQs possessing two distinct inert substituents, i.e., iBu and Ph that exhibit different solubility as well as thermal stability [101]. It is well known that the type of inert and functional groups determine the physical and chemical properties of silsesquioxane [56,60,87] and as a consequence, may influence the properties of polysiloxanes modified with these compounds.…”

“…Silsesquioxanes represent a versatile group of organosilicon species, with distinct and defined structures, but the most popular are cage silsesquioxanes, especially cubic T 8 [56,57]. Rigid inorganic, Si-O-Si based core with organic substituents (reactive or inert) coordinated around the silicon vertices, determine properties and potential application of these molecules [58][59][60][61][62][63][64]. The most significant branch of SQs successful application is material chemistry as nanofillers and polymers modifiers [65][66][67][68][69][70][71].…”

On the Potential of Silicon as a Building Block for Life

“…Many complex cage systems, composed of multiple connected ringed systems, are also known. One example is silsesquioxanes, containing Si-O-bond-rich "core" structures that can be modified with other groups that allow for a precise spatial orientation of the entire molecule, therefore opening the possibility for the complex regulation of the chemical accessibility of the core structure [38][39][40][41].…”

Synthesis of (Multi)Silylalkynyl-Substituted Silsesquioxanes Obtained via Silylative Coupling Reaction

“…SQs are a specific type of organosilicon compounds with a rigid inorganic framework of Si−O−Si bonds composing a so-called core and reactive and/or inert organic groups that referred to as a coronae. 1,2 They constitute a family of several types of structures that have gained significant interest in their chemistry and application. While cubic mono-or octafunctional derivatives of T 8 -type are still considered of fundamental importance, the influence of double-decker SQs (DDSQ) has become more recognizable.…”

“…Catalytic transformations have become one of the most powerful tools for the synthesis of functionalized organosilicon compounds, also silsesquioxanes (SQs). SQs are a specific type of organosilicon compounds with a rigid inorganic framework of Si–O–Si bonds composing a so-called core and reactive and/or inert organic groups that referred to as a coronae. , They constitute a family of several types of structures that have gained significant interest in their chemistry and application. While cubic mono- or octafunctional derivatives of T 8 -type are still considered of fundamental importance, the influence of double-decker SQs (DDSQ) has become more recognizable. , The physicochemical properties of silsesquioxanes that determine their potential applications derive from the core type and are also governed by the nature and more decisively by number of functional groups attached to the SQ core.…”