ИСТИНА

The paper deals with methods of introduction of side-groups, which can increase the selectivity of CO2-separation due to their increased solubility relative to CO2. "Ionic liquids" chemically bonded to the polymer matrix may be considered as such groups. The introduction of functional groups was carried out using two-step technology: -the preparation of Br-containing polymer; -polymer-analogical reactions with highly reactive Br-containing groups in the polymer (quaternization by nitrogen-containing compounds of different structure e.g. n-buthylimidazole and trimethylamine). Among PTMSP and PMP derivatives of different microstructure trans-enriched polymers exhibit greater permeability, high molecular weight and good mechanical properties. Therefore, PTMSP and PMP containing high amount of trans-units were used as precursors. In the present research we developed the method of selective PTMSP and PMP bromination, using N-bromosuccinimide as brominating agent. The results of NMR and IR-spectroscopy showed that bromination proceeded selectively and formed PTMSP containing CH2Br-groups near silicon atom and PMP with -CH2Br-groups near the double bond. As a result samples containing up to 40% of Br for PTMSP and 20% of Br for PMP were produced. The obtained Br-containing polymers possess good film-forming ability, thermal and thermo-oxidative stability, high gas-permeability and exhibit higher resistance to C5-C12 hydrocarbons than the original PTMSP and PMP. From Br-containing samples, used as precursors, polymers containing units quaternized by n-buthylimidazole and trimethylamine were obtained. The presence of quaternized units was confirmed by elemental analysis, IR and NMR-results. Mechanical, thermal and thermo-oxidative stability of the obtained quaternized polymers as well as their permeability to individual gases (N2, H2, CO2) were determined. The relationship between the amount of functional groups in the polymer and the selectively of CO2-separation from various gas mixtures has been pointed out.