Synthesis of cross-linked comb-type polysiloxane for polymer electrolyte membranes

Abstract

Hydrosilylation reaction of 2.4.6.8-tetrahydro-2.4.6.8-tetramethylcyclotetrasiloxane with allyl acetoacetate and vinyltriethoxysilane at 1:3:1 ratio of initial compounds in the presence of Karstedt's catalyst (Pt 2 [(VinSiMe 2 ) 2 O] 3 ), platinum hydrochloric acid (0.1 M solution in THF) and platinum on the carbon have been studied and D 4 R,R' type methylorganocyclotetrasiloxane has been obtained. Ring-opening co-polymerization reactions of methylorganocyclotetrasiloxane and hexamethyldisiloxane, in the presence of catalytic amount of powder-like potassium hydroxide, have been carried out and linear methylsiloxane oligomer with regular arrangement of propyl acetoacetate and triethoxysilane groups in the side chain has been obtained. The synthesized methylorganocyclotetrasiloxane and oligomers were studied by FTIR, 1 H, 13 C, 29 Si NMR spectroscopy. Comb-type oligomers were characterized by gel-permeation chromatography, wide-angle X-ray and differential scanning calorimetric methods. Via sol-gel processes of doped with lithium trifluoromethylsulfonate (triflate) or lithium bis-(trifluoromethylsulfonyl)imide oligomer systems solid polymer electrolyte membranes have been obtained. The dependence of ionic conductivity as a function of temperature and salt concentration has been studied. The electrical conductivity of these materials at room temperature belongs to the range of 7x10 -8 to 4x10 -6 S cm -1 and depends on the structures of grafted anion receptors and the polymer backbones.

Development of a New Non-Invasive Approach to Treat of Infantile Hemangioma with Growth-Inhibiting Endogenous Factors (Non-Invasive Approach to Treat of Infantile Hemangioma with Endogenous Factors)

“…Immobilization of TPC and calmoduline in the polyvinyl alcohol functional polymer: TPC and exogenous calmodulin 0.2-0.1 mg/ ml are added to the aqueous solution of the polyvinyl alcohol polymer. After mixing well, it is poured into the Teflon frame and after 48 hours, 50 μm thick and 1.5 cm diameter films are obtained, in which the active substance is immobilized [7,8].…”

Designing Polymer Electrolytes via Ring‐Opening Polymerization for Advanced Lithium Batteries

“…By anionic ROP and further cross-linking of Si-O eightmembered rings with side-chain-modified PEO segments, a filmformable electrolyte was prepared by Lee et al Surprisingly, the room-temperature ionic conductivity of the electrolyte could exceed 1 × 10 −5 S cm −1 . [157] Abadie et al reported a similar work, [158] but the conductivity test alone was not sufficient to demonstrate the utility of the electrolyte. Xue Group synthesized a three-block polymer by anionic ROP and further crosslinked to obtain a SPE.…”

“…[ 157 ] Abadie et al. reported a similar work, [ 158 ] but the conductivity test alone was not sufficient to demonstrate the utility of the electrolyte. Xue Group synthesized a three‐block polymer by anionic ROP and further crosslinked to obtain a SPE.…”

Coupling agents with 2,4,6,8-tetramethylcyclotetrasiloxane core – synthesis and application in styrene–butadiene rubber production

“…26 Hydrosilylation reactions focused on the modification of DH 4 with two different substrates (olefin or alkyne) leading to products with different content of the groups DSP 3 , DS 2 P 2 or DS 3 P are a more challenging task, definitely less frequently described in the scientific journals, and mainly disclosed in the patent literature. [52][53][54][55][56][57][58] Nevertheless, it must be noted that the distribution of both groups coming from two starting materials in the structures of synthesized products is often random. Moreover, detailed characterization of these compounds by NMR methods has not been provided in the majority of these reports.…”