Hyperbranched polycarbosiloxanes and polycarbosilanes via bimolecular non-linear hydrosilylation polymerization

Facile synthesis of cyclosiloxane-based polymers for hybrid film formation

“…[1][2][3] In addition, the stoichiometric monomer ratio and the total monomer concentration were tuned carefully to prepare chemically soluble polymers: linear structured polymers. 8,9,[38][39][40] Initially, the hydrosilylation reaction of TMCS with DTMS (DVHS) monomers was performed in toluene at stoichiometric monomer ratios of TMCS : DTMS (DVHS) = 1 : 1 or 1 : 2 (mol mol −1 ), remaining at 1 mol L −1 of total monomer concentration. With the reaction solution maintained as transparent and in a homogeneous liquid state during the reaction at the monomer ratio of 1 : 1, the gelation was observed at the ratio of 1 : 2.…”

“…The 29 Furthermore, the residual silane group was determined quantitatively using copolymer samples of the 1 H NMR spectrum using a known mass of hexamethylbenzene as a stan- dard. 8 For TMCS-DTMS and TMCS-DVHS hybrid polymers, residual Si-H groups were determined, respectively, as 4.4 and 2.34 mmol g −1 . Assuming that the hydrosilylation reaction between TMCS and DTMS (or DVHS) at the mixing ratio of 1 : 1 occurred under stoichiometric conditions, two of four Si-H groups in TMCS react with two vinyl groups of DTMS (DVHS); the amounts of residual Si-H groups are calculated, respectively, as 4.2 and 2.4 mmol g −1 , for TMCS-DTMS and TMCS-DVHS hybrid polymers.…”

“…For example, a facile approach for hyperbranched polymers using multifunctional monomers has been investigated systematically. 8,9 The approach offers high synthetic versatility and compositional diversity of well-known copolymerization principles. 9 To prepare siloxane-based hybrid polymeric materials from multifunctional organosiloxanes, a convenient synthetic method is the hydrosilylation reaction, the addition of an Si-H group to an unsaturated carbon-carbon bond using a Pt-catalyst.…”

Synthesis and characterization of fully biobased polyesters with tunable branched architectures

“…56 As relevant reported examples, but not limited to, BMNLP strategy has been used to synthesize various hyperbranched polyurethanes, polyesters, polyethers, polyamides, as well as polycarbosiloxanes and polysiloxanes. [57][58][59][60][61][62] Developed by Flory and Stockmayer, 63,64 this method allows the prediction of a number of properties of the branching reaction which can undergo gelation by establishing the criterion for the gelation of the reactive system in terms of molar ratios of the reactive groups. In this method, the critical conditions for gelation to accommodate arbitrary functionalities of the reactive monomers in an [aA x + bB y ] system where x ≥ 2 and y ≥ 3 are generalized in the following equation:…”

Organosilicon polymer-derived ceramics: An overview

“…Polysilylcarbodiimides are moisture sensitive, and can be synthesized by the pyridine-catalyzed polycondensation reaction of chlorosilanes with bis(trimethylsilylcarbodiimide) [59]. As another type of SiOC-based ceramic precursors, the hyperbranched-polycarbosiloxanes have been reported to improve ceramic yields [60][61][62]. Boron-containing organosilicon polymers, including polyborosilane, polyborosiloxane, polyborosilazane, and their derivatives are often used as the precursors for fabricating borosilicon ceramics [63][64][65].…”