Structure and thermodynamic stability of polyblock copolymers of poly-(arylate-dimethyl siloxane)

Rogovina, L.Z.; Chalykh, A.Ye.; Adamova, L. V.; Aliyev, A.D.; Nekhayenko, Ye.A.; Valetskii, P. M.; Slonimskii, G.L.; Tager, A.A.

doi:10.1016/0032-3950(80)90028-3

Cited by 10 publications

(1 citation statement)

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“…Polyorganosiloxane block copolymers have been widely investigated [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Such copolymers combine the specific practically useful properties of polydimethylsiloxanes (hydrophobicity, high gas permeability and low free surface energy) with the hydrophilicity, heat sensitivity, crystallization ability and relatively low melting point of poly(ethylene oxide) blocks.…”

Section: Introductionmentioning

confidence: 99%

Amphiphilic Poly(dimethylsiloxane-ethylene-propylene oxide)-polyisocyanurate Cross-Linked Block Copolymers in a Membrane Gas Separation

et al. 2021

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Amphiphilic poly(dimethylsiloxane-ethylene-propylene oxide)-polyisocyanurate cross-linked block copolymers based on triblock copolymers of propylene and ethylene oxides with terminal potassium-alcoholate groups (PPEG), octamethylcyclotetrasiloxane (D4) and 2,4-toluene diisocyanate (TDI) were synthesized and investigated. In the first stage of the polymerization process, a multiblock copolymer (MBC) was previously synthesized by polyaddition of D4 to PPEG. The usage of the amphiphilic branched silica derivatives associated with oligomeric medium (ASiP) leads to the structuring of block copolymers via the transetherification reaction of the terminal silanol groups of MBC with ASiP. The molar ratio of PPEG, D4, and TDI, where the polymer chains are packed in the “core-shell” supramolecular structure with microphase separation of the polyoxyethylene, polyoxypropylene and polydimethylsiloxane segments as the shell, was established. Polyisocyanurates build the “core” of the described macromolecular structure. The obtained polymers were studied as membrane materials for the separation of gas mixtures CO2/CH4 and CO2/N2. It was found that obtained polymers are promising as highly selective and productive membrane materials for the separation of gas mixtures containing CO2, CH4 and N2.

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