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

Membranes ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 42 ◽  
Author(s):  
Ilsiya M. Davletbaeva ◽  
Ilnaz I. Zaripov ◽  
Alexander I. Mazilnikov ◽  
Ruslan S. Davletbaev ◽  
Raphael R. Sharifullin ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Gas Separation ◽  
Gas Transport ◽  
Toluene Diisocyanate ◽  
Great Promise ◽  
Internal Cavity ◽  
Polar Molecules ◽  
Supramolecular Organization ◽  
Membrane Gas Separation ◽  
Separation Membranes

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.

Synthesis and Formation of Gas Separation Membranes Based on Polyalkylenesiloxanes

2019 ◽  
Vol 816 ◽  
pp. 233-237
Author(s):  
Ilya L. Borisov ◽  
N.V. Ushakov ◽  
E.A. Grushevenko ◽  
E.S. Finkel’stein ◽  
V.V. Volkov
Keyword(s):  
Gas Separation ◽  
Separation Process ◽  
Membrane Gas Separation ◽  
Gas Separation Membrane ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Gas Transport Properties ◽  
Separation Membrane ◽  
Transport Component ◽  
The Ideal

The membrane gas separation is currently a competitive separation process. The heart of the membrane gas separation process is the membrane, more precisely the material from which it is made. The search for a selective material to develop a gas separation membrane is an important task presently. Membrane materials with advantageous impact of sorption transport component is a good material for the selective fractionating С1-С4 hydrocarbons with obtaining methane fraction and C3+ fraction. Such materials are polyalkylenesiloxanes. In this work, the optimal concentration of a curing agent (tetraethoxysilane) was defined (5%). Such concentration is necessary for obtaining constant membrane film with high gas transport properties: the permeability coefficient for n-butane is 7400; the ideal selectivity of n-butane/methane is 25.5.

scholarly journals Organosilica-Modified Multiblock Copolymers for Membrane Gas Separation

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3579
Author(s):  
Ilsia M. Davletbaeva ◽  
Alexander Yu. Alentiev ◽  
Zulfiya Z. Faizulina ◽  
Ilnaz I. Zaripov ◽  
Roman Yu. Nikiforov ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Toluene Diisocyanate ◽  
Multiblock Copolymers ◽  
Gas Solubility ◽  
Membrane Gas Separation ◽  
Modified Polymers ◽  
Temperature Relaxation ◽  
Solubility Coefficients ◽  
Modified Block ◽  
The Ideal

Organosubstituted silica derivatives were synthesized and investigated as modifiers of block copolymers based on macroinitiator and 2,4-toluene diisocyanate. A peculiarity of the modified block copolymers is the existence in their structure of coplanar rigid polyisocyanate blocks of acetal nature (O-polyisocyanates). Organosubstituted silica derivatives have a non-additive effect on high-temperature relaxation and α-transitions of modified polymers and exhibit the ability to influence the supramolecular structure of block copolymers. The use of the developed modifiers leads to a change in the gas transport properties of block copolymers. The increase of the permeability coefficients is due to the increase of the diffusion coefficients. At the same time, the gas solubility coefficients do not change. An increase in the ideal selectivity for a number of gas pairs is observed. An increase in the selectivity for the CO2/N2 gas pair (from 25 to 39) by 1.5 times demonstrates the promising use of this material for flue gases separation.

Thermally rearranged (TR) bismaleimide-based network polymers for gas separation membranes

2016 ◽  
Vol 52 (93) ◽  
pp. 13556-13559 ◽  
Author(s):  
Yu Seong Do ◽  
Won Hee Lee ◽  
Jong Geun Seong ◽  
Ju Sung Kim ◽  
Ho Hyun Wang ◽  
...  
Keyword(s):  
Transport Properties ◽  
Gas Separation ◽  
Gas Transport ◽  
Polymer Membranes ◽  
Interpenetrating Networks ◽  
Network Polymers ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Gas Transport Properties ◽  
First Time

Highly permeable thermally rearranged polymer membranes based on bismaleimide derivatives are reported for the first time. The membranes form semi-interpenetrating networks with other polymers endowing them with superior gas transport properties.

Cyclodextrin-based supramolecular polymeric nanoparticles for next generation gas separation membranes

2015 ◽  
Vol 3 (28) ◽  
pp. 14876-14886 ◽  
Author(s):  
Shereen Tan ◽  
Qiang Fu ◽  
Joel. M. P. Scofield ◽  
Jinguk Kim ◽  
Paul A. Gurr ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Transport ◽  
Polymeric Nanoparticles ◽  
Composite Membranes ◽  
Dynamic Nature ◽  
Selective Layer ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
First Time ◽  
Nanoparticle Additives

Cyclodextrin-based supramolecular polyrotaxanes are for the first time used as soft nanoparticle additives for the selective layer of composite membranes. They exhibit outstanding gas transport characteristics at low additive percentages, due to the dynamic nature of the PDMS side chains.

scholarly journals Synthesis and Characterization of Novel Nanoporous Gl-POSS-Branched Polymeric Gas Separation Membranes

Membranes ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 110 ◽  
Author(s):  
Ilnaz I. Zaripov ◽  
Ilsiya M. Davletbaeva ◽  
Zulfiya Z. Faizulina ◽  
Ruslan S. Davletbaev ◽  
Aidar T. Gubaidullin ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Permeability ◽  
Chemical Properties ◽  
Toluene Diisocyanate ◽  
Main Reaction ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Oligomeric Silsesquioxane ◽  
Physical And Chemical

Novel nanoporous Gl-POSS-branched polymers based on the macroinitiator of anionic nature, 2,4-toluene diisocyanate, and octaglycidyl polyhedral oligomeric silsesquioxane (Gl-POSS) were obtained as gas separation membranes. The synthesis of polymers was carried out using various loads of Gl-POSS. It was found that the main reaction proceeding with 2,4-toluene diisocyanate is the polyaddition, accompanied by the isocyanate groups opening of the carbonyl part. This unusual opening of isocyanate groups leads to the formation of coplanar acetal nature polyisocyanates (O-polyisocyanate). The terminal O-polyisocyanate links initiate the subsequent opening of the epoxide rings in Gl-POSS. As a result, Gl-POSS serves as a hard and bulky branching agent and creates the specific framing supramolecular structure, which leads to the formation of nanopores in the polymer, where the flexible polyether components are located inside the cavities. Thermal, mechanical, physical, and chemical properties of the obtained polymers were studied at various Gl-POSS contents in the polymer matrix. It was found that these polymers show high selectivity of gas transport properties for pure ammonia relative to nitrogen and hydrogen at ambient temperature. Measurements showed that the gas permeability coefficients and the values of ideal selectivity were in a non-additive dependence to the Gl-POSS content.

Synthesis and characterization of triptycene-based polyimides with tunable high fractional free volume for gas separation membranes

2014 ◽  
Vol 2 (33) ◽  
pp. 13309-13320 ◽  
Author(s):  
Jennifer R. Wiegand ◽  
Zachary P. Smith ◽  
Qiang Liu ◽  
Christopher T. Patterson ◽  
Benny D. Freeman ◽  
...  
Keyword(s):  
Free Volume ◽  
Gas Separation ◽  
Gas Transport ◽  
Synthesis And Characterization ◽  
Fractional Free Volume ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Selective Separations ◽  
Polyimide Membranes

Triptycene-containing polyimide membranes with tunable fractional free volume promoting fast gas transport and selective separations.

scholarly journals Mitigating the Agglomeration of Nanofiller in a Mixed Matrix Membrane by Incorporating an Interface Agent

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 328
Author(s):  
Manh-Tuan Vu ◽  
Gloria M. Monsalve-Bravo ◽  
Rijia Lin ◽  
Mengran Li ◽  
Suresh K. Bhatia ◽  
...  
Keyword(s):  
Gas Separation ◽  
Polymer Matrix ◽  
Ion Beam ◽  
High Surface ◽  
Mixed Matrix Membrane ◽  
Mechanical And Thermal Properties ◽  
Separation Membranes ◽  
Surface Areas ◽  
Separation Membrane ◽  
Focus Ion Beam

Nanodiamonds (ND) have recently emerged as excellent candidates for various applications including membrane technology due to their nanoscale size, non-toxic nature, excellent mechanical and thermal properties, high surface areas and tuneable surface structures with functional groups. However, their non-porous structure and strong tendency to aggregate are hindering their potential in gas separation membrane applications. To overcome those issues, this study proposes an efficient approach by decorating the ND surface with polyethyleneimine (PEI) before embedding it into the polymer matrix to fabricate MMMs for CO2/N2 separation. Acting as both interfacial binder and gas carrier agent, the PEI layer enhances the polymer/filler interfacial interaction, minimising the agglomeration of ND in the polymer matrix, which is evidenced by the focus ion beam scanning electron microscopy (FIB-SEM). The incorporation of PEI into the membrane matrix effectively improves the CO2/N2 selectivity compared to the pristine polymer membranes. The improvement in CO2/N2 selectivity is also modelled by calculating the interfacial permeabilities with the Felske model using the gas permeabilities in the MMM. This study proposes a simple and effective modification method to address both the interface and gas selectivity in the application of nanoscale and non-porous fillers in gas separation membranes.

scholarly journals The spirobichroman-based polyimides with different side groups: from structure–property relationships to chain packing and gas transport performance

RSC Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 5086-5095
Author(s):  
Shuli Wang ◽  
Xiaohua Tong ◽  
Chunbo Wang ◽  
Xiaocui Han ◽  
Sizhuo Jin ◽  
...  
Keyword(s):  
Dihedral Angle ◽  
Gas Separation ◽  
Gas Transport ◽  
Critical Role ◽  
Polymer Membranes ◽  
Separation Performance ◽  
Structure Property ◽  
Chain Packing ◽  
Structure Property Relationships ◽  
Gas Separation Performance

Effect of substituents on the dihedral angle and chain packing plays a critical role in the enhancement in the gas separation performance of polymer membranes.

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