Siloxane Oligomers with Epoxy Pendant Groups

Abstract

Summary: Hydrosilylation reaction of 2.4.6.8-tetrahydro-2.4.6.8-tetramethylcyclotetrasiloxane with allyl glycidyl ether at 1:4.1 molar ratios of initial compounds in the presence of platinum hydrochloric acid (0.1 M solution in THF), Karstedt's catalyst (Pt 2 [(VinSiMe 2 ) 2 O] 3 ) and platinum on the carbon have been studied and 2.4.6.8-tetrapropyl glycidyl-2.4.6.8-tetramethylcyclotetrasiloxane has been obtained. For hydrosilylation reaction order, rate constants and activation energy have been determined in the presence of Karstedt's catalyst. Ring-opening polymerization reaction of D 4 R in the presence of catalytic amount of powder-like potassium hydroxide has been carried out. Linear methylsiloxane oligomer with regular arrangement of propyl glycidyl groups in the side chain has been obtained. The reaction of epoxy group containing compounds with primary and secondary amines has been carried out and corresponding amino hydroxyl groups containing compounds have been obtained. The synthesized organosiloxanes were studied by FTIR, 1 H, 13C and 29 Si NMR spectroscopies. Comb-type oligomers were characterized by sizeexclusion chromatography, wide-angle X-ray methods. Via sol-gel processes of 2.4.6.8-tetrapropyl glycidyl-2.4.6.8-tetramethylcycltetrasiloxane, ethylene diamine and tetraethoxysilane doped with lithium trifluoromethylsulfonate (triflate) or lithium bis(trifluoromethylsulfonyl)imide solid polymer electrolyte membranes have been obtained. The dependence of ionic conductivity as a function of temperature and salt concentration has been studied. It is shown that the conductivity of membrane containing 15 wt % of triflate type salt concentration is higher on the 3 orders than analogous containing the same amount of the salt lithium bis(trifluoromethylsulfonyl)imide. The difference is described in terms of ion mobilities in the polymer matrix.

From multi-functional siloxane-based cyclic carbonates to hybrid polyhydroxyurethane thermosets

“…For example, the modification of siloxanes with epoxy groups is often reported. [26]- [28] The use of isocyanates grafted on siloxane chains afforded hybrid PU-siloxane polymers of high performances. [29]- [34] The synthesis of organic/inorganic hybrid PHU materials is therefore a promising approach to get rid of the use of isocyanates.…”

Interpenetrating Network on the Basis of Methylcyclotetrasiloxane Matrix

“…It was established that hydrosilylation reaction of D 4 H with allyl trifluoroacetate and vinyltriethoxysilane proceeds vigorously at the beginning stages first 3-7 min. From literature [14] it is known that hydrosilylation reaction of 2,4, The obtained organocyclotetrasiloxane I is a transparent, viscous product well soluble in ordinary organic solvents. The structure and composition of obtained compound were determined by elemental analysis, molecular mass, molecular refraction, FTIR, 1 H, 13 C and 29 Si NMR spectra data.…”

“…The second way of obtaining comb-type methylsiloxane oligomers is a polymerization reaction in advanced organocyclisiloxanes [14][15][16].…”

Obtaining of Nanocomposites Based on Comb-Type Siloxane and Reduced Graphene Oxide

“…The aim of presented work was obtaining of photopolymers based on PDMS [11][12][13]. For this purpose, we have conducted hydrosilylation reaction of polymethylhydrosiloxane (PMHS) with allyl acrylate and vinyltriethoxysilane in the presence of Karstedt's catalyst in toluene.…”