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

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 94
Author(s):  
Ilsiya M. Davletbaeva ◽  
Ilgiz M. Dzhabbarov ◽  
Askhat M. Gumerov ◽  
Ilnaz I. Zaripov ◽  
Ruslan S. Davletbaev ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Propylene Oxide ◽  
Microphase Separation ◽  
Gas Mixtures ◽  
Toluene Diisocyanate ◽  
Polymerization Process ◽  
Ethylene Propylene ◽  
Membrane Materials ◽  
The Core ◽  
Separation Of Gas Mixtures

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.

Copolymers of 1-(3,3,3-Trifluoropropyldimethylsilyl)-1-Propyne with 1-Trimethylsilyl-1-Propyne as Membrane Materials for Separation of Gas Mixtures Containing Hydrocarbons

2018 ◽  
Vol 58 (13) ◽  
pp. 1123-1128
Author(s):  
A. A. Kossov ◽  
E. G. Litvinova ◽  
A. A. Ezhov ◽  
V. S. Khotimskii ◽  
S. M. Shishatskii ◽  
...  
Keyword(s):  
Gas Mixtures ◽  
Membrane Materials ◽  
Separation Of Gas Mixtures

New membrane materials based on crosslinked poly(ethylene glycols) and ionic liquids for separation of gas mixtures containing CO2

2014 ◽  
Vol 56 (6) ◽  
pp. 900-908 ◽  
Author(s):  
E. M. Erdni-Goryaev ◽  
A. Yu. Alent’ev ◽  
A. S. Shaplov ◽  
D. O. Ponkratov ◽  
E. I. Lozinskaya
Keyword(s):  
Ionic Liquids ◽  
Gas Mixtures ◽  
Membrane Materials ◽  
Ethylene Glycols ◽  
Separation Of Gas Mixtures ◽  
Poly Ethylene

Synthesis of Polyurethane Dendrimers and Transfer Properties of Dye

2013 ◽  
Vol 457-458 ◽  
pp. 65-71
Author(s):  
Jing Ru Jia
Keyword(s):  
Methyl Orange ◽  
Phase Transfer ◽  
Raw Materials ◽  
Toluene Diisocyanate ◽  
Polymerization Process ◽  
Process Conditions ◽  
Addition Polymerization ◽  
Different Temperatures ◽  
The Difference ◽  
Transfer Properties

The polyfunctional organic compounds 2- hydroxymethyl -1,4- butanediol (trihydric alcohol) and toluene diisocyanate -2, 4- diisocyanate (TDI) were taken as the raw materials in this study. A polyurethane dendrimer was synthesized by utilizing the difference in the reaction activity of two isocyanate groups of TDI at different temperatures. The polymerization process conditions were studied. The addition polymerization of para-position NCO groups occurred at 50 °C, and that of ortho NCO groups occurred at 90 °C. According to the structure of the dendrimer synthesized, methyl orange was used as the guest molecule. Consequently, the aqueous methyl orange showed a phase transfer. With the increase of dendrimer concentration, the transfer rate of methyl orange increased.

Anomalous melt elasticity of isotactic ethylene—propylene block copolymers

Polymer ◽  
1975 ◽  
Vol 16 (12) ◽  
pp. 936-937 ◽  
Author(s):  
F.N. Cogswell ◽  
D.E. Hanson
Keyword(s):  
Block Copolymers ◽  
Ethylene Propylene ◽  
Melt Elasticity

scholarly journals Cylindrical Micelles by the Self-Assembly of Crystalline-b-Coil Polyphosphazene-b-P2VP Block Copolymers. Stabilization of Gold Nanoparticles

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1772 ◽  
Author(s):  
Maria de los Angeles Cortes ◽  
Raquel de la Campa ◽  
Maria Luisa Valenzuela ◽  
Carlos Díaz ◽  
Gabino A. Carriedo ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymers ◽  
Self Assembly ◽  
Cationic Polymerization ◽  
The Self ◽  
The Novel ◽  
Selective Solvent ◽  
The Core ◽  
Cylindrical Micelles ◽  
Main Factor

During the last number of years a variety of crystallization-driven self-assembly (CDSA) processes based on semicrystalline block copolymers have been developed to prepare a number of different nanomorphologies in solution (micelles). We herein present a convenient synthetic methodology combining: (i) The anionic polymerization of 2-vinylpyridine initiated by organolithium functionalized phosphane initiators; (ii) the cationic polymerization of iminophosphoranes initiated by –PR2Cl2; and (iii) a macromolecular nucleophilic substitution step, to prepare the novel block copolymers poly(bistrifluoroethoxy phosphazene)-b-poly(2-vinylpyridine) (PTFEP-b-P2VP), having semicrystalline PTFEP core forming blocks. The self-assembly of these materials in mixtures of THF (tetrahydrofuran) and 2-propanol (selective solvent to P2VP), lead to a variety of cylindrical micelles of different lengths depending on the amount of 2-propanol added. We demonstrated that the crystallization of the PTFEP at the core of the micelles is the main factor controlling the self-assembly processes. The presence of pyridinyl moieties at the corona of the micelles was exploited to stabilize gold nanoparticles (AuNPs).

Sign in / Sign up

Export Citation Format

Share Document