Synthesis of Block Copolymers Based on a Macroinitiator and 2,4-Toluene Diisocyanate

Davletbaeva, I. M.; Mazilnikov, Alexander I; Zaripov, I. I.; Davletbaev, R. S.; Gumerov, A. M.; Parfenov, V. V.

doi:10.1134/s1560090418010025

Cited by 8 publications

(11 citation statements)

References 15 publications

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“…They found that the most favorable conditions for the formation of O-polyisocyanate (OPI) structural elements were present when a PPEG with a molecular weight of 4200 g/mol were used. Factors affecting the polyaddition accompanied by the opening of isocyanate groups via the carbonyl component include the use of catalytic amounts of acidic compounds, water in combination with trimethylamine and maintenance of fairly low temperatures [49].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Study of Gas Transport Properties of Polymers Based on Macroinitiators and 2,4-Toluene Diisocyanate

et al. 2019

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Nowadays, block copolymers hold great promise for the design of novel membranes to be applied for the membrane gas separation. In this regard, microporous block copolymers based on a macroinitiator with an anionic nature, such as potassium-substituted block copolymers of propylene oxide and ethylene oxide (PPEG) and 2,4-toluene diisocyanate (TDI), were obtained and investigated as effective gas separation membranes. The key element of the macromolecular structure that determines the supramolecular organization of the studied polymers is the coplanar blocks of polyisocyanates with an acetal nature (O-polyisocyanate). In the present research, the influence of the content of peripheral polyoxyethylene (POE) blocks in PPEG on the supramolecular structure processes and gas transport characteristics of the obtained polymers based on PPEG and TDI was investigated. According to the study of polymers if the POE block content is 15 wt %, the polyoxypropylene segments are located in the internal cavity of voids formed by O-polyisocyanate blocks. When the POE block content is 30 wt %, the flexible chain component forms its own microphase outside the segregation zone of the rigid O-polyisocyanate blocks. The permeability for polar molecules, such as ammonia or hydrogen sulfide, significantly exceeds the permeability values obtained for non-polar molecules He, N2 and СН4. A relatively high permeability is also observed for carbon dioxide. At the same time, the content of POE blocks has a small effect on the permeability for all studied gases. The diffusion coefficient increases with an increase in the POE block content in PPEG for all studied gases.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Study of Gas Transport Properties of Polymers Based on Macroinitiators and 2,4-Toluene Diisocyanate

et al. 2019

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“…These polymers are of interest due to their high gas transport characteristics. [48][49][50][51][52][53][54] The specic characteristics of theirs supramolecular structure is polyisocyanate blocks of acetal nature (O-polyisocyanates) as a component with a rigid chain. A scheme of polymers synthesis by the reaction of Microporous polymers modied with ASiP was investigated using FTIR spectroscopy.…”

Section: (E) Modication Of Polymers Based On Tdi and Ppeg With Asipmentioning

confidence: 99%

Synthesis and characterization of amphiphilic branched silica derivatives associated with oligomeric medium

et al. 2019

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“…Membranes based on polyorganosiloxane block copolymers can exhibit high permeability for various gases and good mechanical strength [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. Basically, polyorganosiloxane block copolymers are heterogeneous systems.…”

Section: Introductionmentioning

confidence: 99%

“…The wide possibilities for controlling both the macromolecular and supramolecular structures are associated with multiblock copolymers obtained on the basis of terminated by potassium–alcoholate groups of triblock copolymers of propylene and ethylene oxides (PPEG) and 2,4-toluene diisocyanate (TDI) [ 15 , 37 , 38 , 39 ]. The high activity of the potassium-alcoholate groups of PPEG in the reactions of the opening of isocyanate groups initiated by them by the anionic mechanism was established.…”

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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Synthesis of Block Copolymers Based on a Macroinitiator and 2,4-Toluene Diisocyanate

Cited by 8 publications

References 15 publications

Synthesis and Study of Gas Transport Properties of Polymers Based on Macroinitiators and 2,4-Toluene Diisocyanate

Synthesis and Study of Gas Transport Properties of Polymers Based on Macroinitiators and 2,4-Toluene Diisocyanate

Synthesis and characterization of amphiphilic branched silica derivatives associated with oligomeric medium

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

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