Effects of bulky 2,2′-substituents in dianhydrides on the microstructures and gas transport properties of thermally rearranged polybenzoxazoles

2021 ◽  
Vol 639 ◽  
pp. 119777
Author(s):  
Yao Lu ◽  
Xiaofan Hu ◽  
Won Hee Lee ◽  
Joon Yong Bae ◽  
Jiayi Zhao ◽  
...  
Keyword(s):  
Transport Properties ◽  
Gas Transport ◽  
Gas Transport Properties

The Effect of the Type and Concentration of the Crosslinking Diene on the Gas Transport Properties of Membranes Based on Polyoctylmethylsiloxane

2020 ◽  
Vol 2 (6) ◽  
pp. 399-406
Author(s):  
E. A. Grushevenko ◽  
I. L. Borisov ◽  
D. S. Bakhtin ◽  
V. V. Volkov ◽  
A. V. Volkov
Keyword(s):  
Transport Properties ◽  
Gas Transport ◽  
Gas Transport Properties

New poly(ether imide)s with pendant di-tert-butyl groups: Synthesis, characterization and gas transport properties

2019 ◽  
Vol 217 ◽  
pp. 183-194 ◽  
Author(s):  
N. Belov ◽  
R. Chatterjee ◽  
R. Nikiforov ◽  
V. Ryzhikh ◽  
S. Bisoi ◽  
...  
Keyword(s):  
Transport Properties ◽  
Gas Transport ◽  
Tert Butyl ◽  
Gas Transport Properties

scholarly journals A Molecular Simulation Study of Silica/Polysulfone Mixed Matrix Membrane for Mixed Gas Separation

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2199
Author(s):  
Khadija Asif ◽  
Serene Sow Mun Lock ◽  
Syed Ali Ammar Taqvi ◽  
Norwahyu Jusoh ◽  
Chung Loong Yiin ◽  
...  
Keyword(s):  
Transport Properties ◽  
Molecular Simulation ◽  
Gas Separation ◽  
Membrane Separation ◽  
Gas Transport ◽  
Mixed Matrix ◽  
Mixed Gas ◽  
Gas Transport Properties ◽  
Simulation Results ◽  
Mixed Gases

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.

Gas transport properties of liquid crystalline poly(p-phenyleneterephthalamide)

1992 ◽  
Vol 25 (2) ◽  
pp. 788-796 ◽  
Author(s):  
D. H. Weinkauf ◽  
H. D. Kim ◽  
D. R. Paul
Keyword(s):  
Transport Properties ◽  
Liquid Crystalline ◽  
Gas Transport ◽  
Gas Transport Properties

Synthesis, characterization and gas transport properties of MOF-5 membranes

2011 ◽  
Vol 382 (1-2) ◽  
pp. 82-90 ◽  
Author(s):  
Zhenxia Zhao ◽  
Xiaoli Ma ◽  
Zhong Li ◽  
Y.S. Lin
Keyword(s):  
Transport Properties ◽  
Gas Transport ◽  
Gas Transport Properties

scholarly journals Mixed Matrix Membranes Comprising of ZIF-8 Nanofillers for Enhanced Gas Transport Properties

2016 ◽  
Vol 148 ◽  
pp. 1259-1265 ◽  
Author(s):  
Norwahyu Jusoh ◽  
Yin Fong Yeong ◽  
Kok Keong Lau ◽  
Azmi Mohd Shariff
Keyword(s):  
Transport Properties ◽  
Gas Transport ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Gas Transport Properties ◽  
Matrix Membranes
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