Synthesis, characterization and gas transport properties of novel poly(amine-imide)s containing tetraphenylmethane pendant groups

Polysulfone-based mixed matrix membranes (MMMs) incorporated with silica nanoparticles are a new generation material under ongoing research and development for gas separation. However, the attributes of a better-performing MMM cannot be precisely studied under experimental conditions. Thus, it requires an atomistic scale study to elucidate the separation performance of silica/polysulfone MMMs. As most of the research work and empirical models for gas transport properties have been limited to pure gas, a computational framework for molecular simulation is required to study the mixed gas transport properties in silica/polysulfone MMMs to reflect real membrane separation. In this work, Monte Carlo (MC) and molecular dynamics (MD) simulations were employed to study the solubility and diffusivity of CO2/CH4 with varying gas concentrations (i.e., 30% CO2/CH4, 50% CO2/CH4, and 70% CO2/CH4) and silica content (i.e., 15–30 wt.%). The accuracy of the simulated structures was validated with published literature, followed by the study of the gas transport properties at 308.15 K and 1 atm. Simulation results concluded an increase in the free volume with an increasing weight percentage of silica. It was also found that pure gas consistently exhibited higher gas transport properties when compared to mixed gas conditions. The results also showed a competitive gas transport performance for mixed gases, which is more apparent when CO2 increases. In this context, an increment in the permeation was observed for mixed gas with increasing gas concentrations (i.e., 70% CO2/CH4 > 50% CO2/CH4 > 30% CO2/CH4). The diffusivity, solubility, and permeability of the mixed gases were consistently increasing until 25 wt.%, followed by a decrease for 30 wt.% of silica. An empirical model based on a parallel resistance approach was developed by incorporating mathematical formulations for solubility and permeability. The model results were compared with simulation results to quantify the effect of mixed gas transport, which showed an 18% and 15% percentage error for the permeability and solubility, respectively, in comparison to the simulation data. This study provides a basis for future understanding of MMMs using molecular simulations and modeling techniques for mixed gas conditions that demonstrate real membrane separation.

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Gas transport properties of polyarylates part I: Connector and pendant group effects

Journal of Polymer Science Part B Polymer Physics ◽

10.1002/polb.1995.090330717 ◽

1995 ◽

Vol 33 (7) ◽

pp. 1135-1149 ◽

Cited By ~ 72

Author(s):

M. R. Pixton ◽

D. R. Paul

Keyword(s):

Transport Properties ◽

Gas Transport ◽

Pendant Group ◽

Gas Transport Properties ◽

Group Effects

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

Chemical Communications ◽

10.1039/c6cc06609g ◽

2016 ◽

Vol 52 (93) ◽

pp. 13556-13559 ◽

Cited By ~ 30

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.

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Gas transport properties of polyimide membranes bearing phenyl pendant group

High Performance Polymers ◽

10.1177/0954008316685411 ◽

2017 ◽

Vol 30 (2) ◽

pp. 161-171 ◽

Cited By ~ 4

Author(s):

Guangliang Song ◽

Lina Wang ◽

Dandan Liu ◽

Jianan Yao ◽

Yiming Cao

Keyword(s):

Transport Properties ◽

Gas Transport ◽

Gas Permeability ◽

Pendant Group ◽

Structure Property ◽

Fractional Free Volume ◽

Ether Linkage ◽

Gas Transport Properties ◽

Structure Property Relationship ◽

Biphenyltetracarboxylic Dianhydride

Polyimides (PIs) with single phenyl pendant substitution were prepared based on three diamines containing phenyl pendant group, namely, 2,5-bis(4-aminophenoxy) biphenyl, 2-phenyl-4,4′-diaminodiphenyl ether, and 2,5-diaminobiphenyl (p-PDA), with the dianhydride component of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 3,3′,4,4′-biphenyltetracarboxylic dianhydride, respectively. The physical properties of the membranes were examined, including thermal properties, fractional free volume ( FFV), solubility, and morphological structures, and were compared with the analogues without phenyl pendant. Gas transport properties of the membranes were investigated and discussed from the viewpoint of structure–property relationship. For 6FDA-derived PI membranes, gas permeability increased as the degree of PI backbone rigidity leveled up. Gas transport properties were not improved by the incorporation of phenyl pendant group for 6FDA type containing ether linkage and marginally improved as compared between PI (6FDA/p-PDA) and PI (6FDA/p-phenylenediamine (PDA)). To increase the phenyl substitution density of 6FDA/PDA-type backbone, a novel diamine bearing two phenyl pendant groups, that is, 2,6-diphenyl-1,4-diaminobenzene (p, p′-PDA) was synthesized, and PI derived from 6FDA and p, p′-PDA was prepared. The gas permeability coefficients of PI (6FDA/p, p′-PDA) were remarkably larger than those of PI (6FDA/p-PDA) and PI (6FDA/PDA).

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Pebax-based composite membranes with high gas transport properties enhanced by ionic liquids for CO2 separation

RSC Advances ◽

10.1039/c6ra27221e ◽

2017 ◽

Vol 7 (11) ◽

pp. 6422-6431 ◽

Cited By ~ 42

Author(s):

Mengdie Li ◽

Xiangping Zhang ◽

Shaojuan Zeng ◽

Lu bai ◽

Hongshuai Gao ◽

...

Keyword(s):

Ionic Liquid ◽

Ionic Liquids ◽

Transport Properties ◽

Gas Separation ◽

Gas Transport ◽

Composite Membranes ◽

Co2 Separation ◽

Separation Performance ◽

Gas Transport Properties ◽

Gas Separation Performance

A series of composite membranes with high gas transport properties enhanced by IL and ZIF-8 have been developed. The influence of ionic liquid and ZIF-8 addition on gas separation performance were systematically investigated.

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Photo-oxidative PIM-1 based mixed matrix membranes with superior gas separation performance

Journal of Materials Chemistry A ◽

10.1039/c5ta03776j ◽

2015 ◽

Vol 3 (33) ◽

pp. 17273-17281 ◽

Cited By ~ 62

Author(s):

Lin Hao ◽

Kuo-Sung Liao ◽

Tai-Shung Chung

Keyword(s):

Transport Properties ◽

Gas Separation ◽

Gas Transport ◽

Mixed Matrix Membranes ◽

Separation Performance ◽

Mixed Matrix ◽

Gas Transport Properties ◽

Gas Separation Performance ◽

Matrix Membranes

Photo-oxidative PIM-1 incorporated with ZIF-71 form well-dispersed mixed-matrix membranes with enhanced gas transport properties. These membranes have impressive separation performance for CO2/CH4 and O2/N2.

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