Distinct insight into the use of difunctional double-decker silsesquioxanes as building blocks for alternating A–B type macromolecular frameworks

Abstract

A distinct look at known, hydrosilylation reactions used for the formation of DDSQ-based linear A–B alternating macromolecular systems with DPn > 1000 is presented. Selected physicochemical properties of obtained hybrid co-polymers were determined.

Tricky but repeatable synthetic approach to branched, multifunctional silsesquioxane dendrimer derivatives

“…Also, it was reported that the presence of electron-withdrawing atom(s) increases the reactivity of Si–H moiety. 51 This is in accordance with the Chalk–Harrod's mechanism. 47,63…”

“…Also, it was reported that the presence of electron-withdrawing atom(s) increases the reactivity of Si-H moiety. 51 This is in accordance with the Chalk-Harrod's mechanism. 47,63 The obtained results facilitated the selection of the optimal location of the Si-H and Si-Vi bonds in applied reactants.…”

“…As the hydrosilylation reaction resulted in formation β and α addition products some literature discusses the impact of the location of Si-H moiety (at the SQs core or olefin) on reac- tion selectivity, we decided to verify this. 50,51 For this reason, an analogous hydrosilylation and reduction protocols were designed (PATH B) but varying in the structure of reagents, i.e. iBu 7 T 8 -OSiVi and dichloromethylsilane (Cl 2 MeSiH) were used as substrates.…”

AB-type monomer of polyhedral oligomeric silsesquioxane

“…To obtain these polymers, reactive sites for polycondensation and polyaddition should be introduced; e.g. , amino, 8 vinyl, 4 b – d hydrosilyl, 9 and epoxide 4 a groups. Incompletely condensed POSS (IC-POSS), which is characterized by its partially open cage structure, is instrumental in introducing reactive sites to derive bifunctional monomers (Fig.…”