Hydrosilylation Reactions of Methylhydrosiloxane with Allyl trifluoroacetate, Vinyltriethoxysilaneand Polymer Electrolyte Membranes on their Base

Author: Tamar Gokadze
Keywords: polymethyl¬hydrosiloxane, vinyltriethoxysilane, polymer electrolyte membranes.
Annotation:

Polysiloxanes with their very low melting point (for example, for polydimethylsiloxane Tg = -123oC) are extremely high self-efficacy and high segmental mobility for the best "host" for the transfer of Li+ ions. The second necessary condition for high ionic conductivity is the high solubility of the salt in the polymer, which is very often achieved thanks to donors such as ether oxygen, fluoride groups or the imitation group of polymer electrolytes in the main chain or side groups. Oligo (ethylene glycol), which has been replaced by polysiloxane, has been studied by the ion-conducting polymer "host". The aim of our work was the synthesis of methylsiloxane polymers with propyl trifluoroacetate and ethyltriethoxysilyl groups in the side chain. For this purpose the hydrosilylation reactions of polymethyl¬hydrosiloxane with allyl trifluoroacetate and vinyltriethoxysilane has been studied at 1:28:7 ratio of initial compounds in the presence of Karstedt’s catalysts. The synthesized oligomers were characterized by FTIR, 1H, 13C and 19F NMR spectral data, DSC and TGA analyses, SEM and Energy dispersive X-ray Micro analysis. Via doping of comb-type polymer with lithium salts (lithium trifluoromethanesulfonate (triflate), or lithium bis (trifluoromethanesulfonyl) imide) and sol-gel reactions, polymer electrolyte membranes were obtained. The ionic conductivity of membranes by the impedance method has been studied.