Addition-Type Polynorbornenes with Si(CH3)3Side Groups:  Synthesis, Gas Permeability, and Free Volume

2006 ◽  
Vol 39 (20) ◽  
pp. 7022-7029 ◽  
Author(s):  
E. Sh. Finkelshtein ◽  
K. L. Makovetskii ◽  
M. L. Gringolts ◽  
Yu. V. Rogan ◽  
T. G. Golenko ◽  
...  
Keyword(s):  
Free Volume ◽  
Synthesis Gas ◽  
Gas Permeability

Effect of the casting solvent on the free-volume characteristics and gas permeability of poly[1-(trimethylsilyl)-1-propyne] membranes

2002 ◽  
Vol 87 (3) ◽  
pp. 497-501 ◽  
Author(s):  
Jing Jing Bi ◽  
C. L. Wang ◽  
Y. Kobayashi ◽  
K. Ogasawara ◽  
A. Yamasaki
Keyword(s):  
Free Volume ◽  
Gas Permeability ◽  
Volume Characteristics

scholarly journals The influence of few-layer graphene on the gas permeability of the high-free-volume polymer PIM-1

2016 ◽  
Vol 374 (2060) ◽  
pp. 20150031 ◽  
Author(s):  
Khalid Althumayri ◽  
Wayne J. Harrison ◽  
Yuyoung Shin ◽  
John M. Gardiner ◽  
Cinzia Casiraghi ◽  
...  
Keyword(s):  
Free Volume ◽  
Gas Permeability ◽  
Fused Silica ◽  
Polymer Chains ◽  
Mixed Matrix Membranes ◽  
Multiwalled Carbon ◽  
Layer Graphene ◽  
Permeability Enhancement ◽  
Graphene Content ◽  
Few Layer Graphene

Gas permeability data are presented for mixed matrix membranes (MMMs) of few-layer graphene in the polymer of intrinsic microporosity PIM-1, and the results compared with previously reported data for two other nanofillers in PIM-1: multiwalled carbon nanotubes functionalized with poly(ethylene glycol) (f-MWCNTs) and fused silica. For few-layer graphene, a significant enhancement in permeability is observed at very low graphene content (0.05 vol.%), which may be attributed to the effect of the nanofiller on the packing of the polymer chains. At higher graphene content permeability decreases, as expected for the addition of an impermeable filler. Other nanofillers, reported in the literature, also give rise to enhancements in permeability, but at substantially higher loadings, the highest measured permeabilities being at 1 vol.% for f-MWCNTs and 24 vol.% for fused silica. These results are consistent with the hypothesis that packing of the polymer chains is influenced by the curvature of the nanofiller surface at the nanoscale, with an increasingly pronounced effect on moving from a more-or-less spherical nanoparticle morphology (fused silica) to a cylindrical morphology (f-MWCNT) to a planar morphology (graphene). While the permeability of a high-free-volume polymer such as PIM-1 decreases over time through physical ageing, for the PIM-1/graphene MMMs a significant permeability enhancement was retained after eight months storage.

Evaluation of hydrogen permselective separation from “synthesis gas” components based on single gas permeability measurements on anodic alumina membranes

2011 ◽  
Vol 92 (12) ◽  
pp. 2375-2388 ◽  
Author(s):  
Sophia Th. Vaitsi ◽  
Constantinos E. Salmas ◽  
Orestis G. Tsapekis ◽  
Alexandros P. Katsoulidis ◽  
George P. Androutsopoulos
Keyword(s):  
Synthesis Gas ◽  
Gas Permeability ◽  
Anodic Alumina ◽  
Alumina Membranes

Gas permeability and free volume in poly(amide-b-ethylene oxide)/polyethylene glycol blend membranes

2009 ◽  
Vol 339 (1-2) ◽  
pp. 177-183 ◽  
Author(s):  
Wilfredo Yave ◽  
Anja Car ◽  
Klaus-Viktor Peinemann ◽  
Muhammed Q. Shaikh ◽  
Klaus Rätzke ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Ethylene Oxide ◽  
Free Volume ◽  
Gas Permeability ◽  
Blend Membranes

Positronium Lifetimes and Gas Permeation in Aquivion® for Fuel Cells

2012 ◽  
Vol 733 ◽  
pp. 61-64 ◽  
Author(s):  
Hamdy F.M. Mohamed ◽  
Yoshinori Kobayashi ◽  
Seiichi Kuroda ◽  
Akihiro Ohira
Keyword(s):  
Fuel Cells ◽  
Relative Humidity ◽  
Free Volume ◽  
Room Temperature ◽  
Gas Permeability ◽  
Gas Permeation ◽  
Positronium Lifetime ◽  
Different Temperatures ◽  
Linear Correlations

Variations of ortho-positronium (o-Ps) lifetime and gas permeability of the Aquivion® E8705 membrane were studied as functions of temperature under vacuum and relative humidity at room temperature. When the temperature was varied between 0 and 100 °C in vacuum, the hole volume of Aquivion® E8705, deduced from the ortho-positronium lifetime, gradually increased. However, when the relative humidity was changed at room temperature, the hole volume was essentially unchanged. Good linear correlations between the logarithm of permeabilities of O2 and H2 and reciprocal hole volume at different temperatures indicates the importance role of free volume in gas permeation in dry Aquivion® E8705. However, for hydrated Aquivion® E8705 the permeability less depends on hole volume.

Gas Permeability and Temperature-Dependent Free-Volume Studies in Polyurethane Membranes by Positron Lifetime and Doppler Spectroscopies

2004 ◽  
Vol 445-446 ◽  
pp. 289-291 ◽  
Author(s):  
M.F. Ferreira Marques ◽  
Paulo M. Gordo ◽  
C. Lopes Gil ◽  
Adriano P. de Lima ◽  
D. Placco Queiroz ◽  
...  
Keyword(s):  
Free Volume ◽  
Positron Lifetime ◽  
Gas Permeability ◽  
Temperature Dependent ◽  
Polyurethane Membranes
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