Siloxane oligomers with epoxy pendant groups

Abstract

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 (Pt2[(VinSiMe2) 2O]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 D4R 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, 1H, 13C and 29Si NMR spectroscopies. Comb-type oligomers were characterized by size-exclusion 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. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.