Ab Initio Values of the Gas Transport Properties of Hydrogen Isotopologues and Helium–Hydrogen Mixtures at Low Density

2016 ◽  
Vol 61 (5) ◽  
pp. 1910-1916 ◽  
Author(s):  
Bo Song ◽  
Kai Kang ◽  
Zhuo Zhang ◽  
Xiaopo Wang ◽  
Zhigang Liu
Keyword(s):  
Ab Initio ◽  
Transport Properties ◽  
Gas Transport ◽  
Low Density ◽  
Gas Transport Properties ◽  
Hydrogen Mixtures

scholarly journals Hollow Fiber Porous Nanocomposite Membranes Produced via Continuous Extrusion: Morphology and Gas Transport Properties

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2311 ◽  
Author(s):  
Zahir Razzaz ◽  
Denis Rodrigue
Keyword(s):  
Transport Properties ◽  
Hollow Fiber ◽  
Cellular Structure ◽  
Gas Transport ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Nanocomposite Membranes ◽  
Gas Transport Properties ◽  
Continuous Extrusion ◽  
Porous Nanocomposite

In this work, hollow fiber porous nanocomposite membranes were successfully prepared by the incorporation of a porous nanoparticle (zeolite 5A) into a blend of linear low-density polyethylene (LLDPE)/low-density polyethylene (LDPE) combined with azodicarbonamide as a chemical blowing agent (CBA). Processing was performed via continuous extrusion using a twin-screw extruder coupled with a calendaring system. The process was firstly optimized in terms of extrusion and post-extrusion conditions, as well as formulation to obtain a good cellular structure (uniform cell size distribution and high cell density). Scanning electron microscopy (SEM) was used to determine the cellular structure as well as nanoparticle dispersion. Then, the samples were characterized in terms of mechanical and thermal stability via tensile tests and thermogravimetric analysis (TGA), as well as differential scanning calorimetry (DSC). The results showed that the zeolite nanoparticles were able to act as effective nucleating agents during the foaming process. However, the optimum nanoparticle content was strongly related to the foaming conditions. Finally, the membrane separation performances were investigated for different gases (CO2, CH4, N2, O2, and H2) showing that the incorporation of porous zeolite significantly improved the gas transport properties of semi-crystalline polyolefin membranes due to lower cell wall thickness (controlling permeability) and improved separation properties (controlling selectivity). These results show that mixed matrix membranes (MMMs) can be cost-effective, easy to process, and efficient in terms of processing rate, especially for the petroleum industry where H2/CH4 and H2/N2 separation/purification are important for hydrogen recovery.

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
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