Synthesis and Properties of Poly(1-trimethylsilyl-1-propyne) Containing Quaternary Ammonium Salts with Methyl and Ethyl Substituents
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Poly(1-trimethylsilyl-1-propyne) modified with quaternary ammonium salts is synthesized. The introduction of salts into the polymer structure is carried out using a two-step method consisting in the bromination of the starting polymer followed by the addition of tertiary alkylamines—trimethylamine and triethylamine. The presence of ammonium salts is confirmed by the data of organometallic analysis and IR spectroscopy. X-ray diffraction analysis is used to study the supramolecular structure of the materials obtained. The TGA data indicate their high thermal and thermo-oxidative stability. The permeability, solubility, and diffusion coefficients of the poly(1-trimethylsilyl-1-propyne) samples containing trimethylamine and triethylamine salts for individual CO2, N2, and CH4 gases are determined. An increased ideal selectivity for the separation of gas pairs CO2/N2 and CO2/CH4 in modified poly(1-trimethylsilyl-1-propyne) is achieved owing to the increased selectivity of the dissolution of CO2 in quaternary ammonium salts.
We are grateful to I.S. Levin for the XRD studies of polymers and G.N. Bondarenko for IR measurements.
The work was performed within the framework of the State Task for the Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences. The experimental work on the determination of the diffusion coefficients and permeability of the samples was carried out within the framework of the Cooperation Agreement the Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research (Germany) and the Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences. In accordance with the Agreement, each of the parties to the Agreement does the financing of cooperation from its own resources.
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