2 4 toluene diisocyanate 98

Polyoxyethylene oxide H(O–CH₂–CH₂)₉–OH (PEO, molecular weight is 400 g/mol) was purchased from PJSC Nizhnekamskneftekhim (Nizhnekamsk, Russia), tetraethoxysilane (TEOS) was purchased from CJSC Vekton (St. Petersburg, Russia). Potassium diethylene glycolate (DEG-K) with formula H(O–CH₂–CH₂)₂–OK was obtained in laboratory conditions. The block copolymer of propylene and ethylene oxide (PPEG) with formula HO[CH₂CH₂O]_n[CH₂(CH₃)CH₂O]_m[CH₂CH₂O]_nK, where n ≈ 14 and m ≈ 48, molecular weight 4200 g/mol, containing 30 wt.% of peripheral polyoxyethylene blocks, where the content of potassium alcoholate groups is 10.9% from the total number of functional groups, was purchased from PJSC Nizhnekamskneftekhim (Nizhnekamsk, Russia). We purchased 2,4-toluene diisocyanate 98% (TDI) and 3-aminopropyltriethoxysilane (AGM) from Sigma-Aldrich (St. Louis, MO, USA). Polydimethylsiloxane (PDMS, average molecular weight is 30,000 g/mol) was purchased from JSC Kazan factory of Synthetic Rubber (Kazan, Russia).
PEO and PPEG were additionally dried at reduced pressure (approximately 0.1 kPa) and at elevated temperature of 95 °C down to 0.01 wt.% moisture concentration.

The block copolymer of propylene and ethylene oxide (PPEG) with formula HO[CH₂CH₂O]_n[CH₂(CH₃)CH₂O]_m[CH₂CH₂O]_nK, where n ≈ 14 and m ≈ 48, molecular weight 4200 g/mol, containing 30 wt.% of peripheral polyoxyethylene blocks, where the content of potassium alcoholate groups is 10.9% from the total number of functional groups, was purchased from PJSC Nizhnekamskneftekhim (Nizhnekamsk, Russia). Octamethylcyclotetrasiloxane (D₄) was purchased from Nanjing Union Silicon Chemical Co., Ltd. (USI Chemical, Nanjing, China). Amphiphilic branched silica derivatives associated with oligomeric medium (ASiP) was obtained in laboratory conditions [40 ]. 2,4-toluene diisocyanate 98 % (TDI) was purchased from Sigma-Aldrich (St. Louis, MO, USA). PPEG was additionally dried at reduced pressure (approximately 0.1 kPa) and at an elevated temperature of 95 °C down to 0.01% moisture concentration.
In the gas separation investigation of prepared polymers, gases (methane, carbon dioxide, nitrogen) were used with purity no less than 99.995% (NII KM, Moscow, Russia).