Polyphenylsilsesquioxanes. New structures–new properties

Abstract

The review describes the synthesis and properties of various forms of polyphenylsilsesquioxane (PPSQ).

Sequential hydrothiolation–hydrosilylation: a route to the creation of new organosilicon compounds with preset structures

“…4,5 The sequential application of Grignard and hydrosilylation reactions makes it possible to obtain carbosilane dendrimers. 6–8 The preparation of Rebrov’s salts 9,10 from alkoxysilanes is a way for synthesizing silsesquioxane polymer brushes, 11 superbranched siloxanes, 12–15 and siloxane dendrimers. 16…”

“…4,5 The sequential application of Grignard and hydrosilylation reactions makes it possible to obtain carbosilane dendrimers. [6][7][8] The preparation of Rebrov's salts 9,10 from alkoxysilanes is a way for synthesizing silsesquioxane polymer brushes, 11 superbranched siloxanes, [12][13][14][15] and siloxane dendrimers. 16 Studies on new reactions of functional groups in organosilicon compounds or approaches to the use of already known ones open opportunities for adjusting the properties of silicones by modifying their structures.…”

Direct synthesis of tetraalkoxysilanes in a high-pressure mechanochemical reactor

“…PTAS is the primary monomer for the production of a broad range of phenylsilsesquioxanes with diverse structures. 5 Phenylsilsesquioxanes are used as a basis for varnishes, resins, and optical materials; they are included in many polymeric compounds to enhance the physical and mechanical properties. DEDAS is the primary monomer for the production of a unique compound, polyethylsiloxane liquid.…”

Well-defined cyclic silanol derivatives

“…Silsesquioxanes (SQs), hybrid silicon compounds with the empirical formula [RSiO 3/2 ] n (R = H, alkyl and aryl) connecting rigid and thermostable inorganics to chemically flexible organics, have attracted increasing attention over the last 30 years in various research fields. [1][2][3][4] To date, three principal well-defined structured SQs are reported: incompletely condensed SQs ( partial cages), completely condensed SQs (cages, e.g. most studied are T 8 , T 10 and T 12 ) and ladder-type SQs (so-called "laddersiloxanes") (Fig.…”