scholarly journals Physical Aging, Plasticization and Their Effects on Gas Permeation in “Rigid” Polymers of Intrinsic Microporosity

2015 ◽  
Vol 48 (18) ◽  
pp. 6553-6561 ◽  
Author(s):  
Raja Swaidan ◽  
Bader Ghanem ◽  
Eric Litwiller ◽  
Ingo Pinnau
Keyword(s):  
Physical Aging ◽  
Gas Permeation ◽  
Rigid Polymers ◽  
Polymers Of Intrinsic Microporosity ◽  
Intrinsic Microporosity

scholarly journals Free Volume and Gas Permeation in Anthracene Maleimide-Based Polymers of Intrinsic Microporosity

Membranes ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 214-227 ◽  
Author(s):  
Muntazim Khan ◽  
Volkan Filiz ◽  
Thomas Emmler ◽  
Volker Abetz ◽  
Toenjes Koschine ◽  
...  
Keyword(s):  
Free Volume ◽  
Gas Permeation ◽  
Polymers Of Intrinsic Microporosity ◽  
Intrinsic Microporosity

scholarly journals Pentiptycene-based ladder polymers with configurational free volume for enhanced gas separation performance and physical aging resistance

2021 ◽  
Vol 118 (37) ◽  
pp. e2022204118
Author(s):  
Tanner J. Corrado ◽  
Zihan Huang ◽  
Dezhao Huang ◽  
Noah Wamble ◽  
Tengfei Luo ◽  
...  
Keyword(s):  
Free Volume ◽  
Gas Separation ◽  
Physical Aging ◽  
Gas Permeation ◽  
Separation Performance ◽  
Structure Property ◽  
Mixed Gas ◽  
Initial Separation ◽  
Primary Advantage ◽  
Polymers Of Intrinsic Microporosity

Polymers of intrinsic microporosity (PIMs) have shown promise in pushing the limits of gas separation membranes, recently redefining upper bounds for a variety of gas pair separations. However, many of these membranes still suffer from reductions in permeability over time, removing the primary advantage of this class of polymer. In this work, a series of pentiptycene-based PIMs incorporated into copolymers with PIM-1 are examined to identify fundamental structure–property relationships between the configuration of the pentiptycene backbone and its accompanying linear or branched substituent group. The incorporation of pentiptycene provides a route to instill a more permanent, configuration-based free volume, resistant to physical aging via traditional collapse of conformation-based free volume. PPIM-ip-C and PPIM-np-S, copolymers with C- and S-shape backbones and branched isopropoxy and linear n-propoxy substituent groups, respectively, each exhibited initial separation performance enhancements relative to PIM-1. Additionally, aging-enhanced gas permeabilities were observed, a stark departure from the typical permeability losses pure PIM-1 experiences with aging. Mixed-gas separation data showed enhanced CO2/CH4 selectivity relative to the pure-gas permeation results, with only ∼20% decreases in selectivity when moving from a CO2 partial pressure of ∼2.4 to ∼7.1 atm (atmospheric pressure) when utilizing a mixed-gas CO2/CH4 feed stream. These results highlight the potential of pentiptycene’s intrinsic, configurational free volume for simultaneously delivering size-sieving above the 2008 upper bound, along with exceptional resistance to physical aging that often plagues high free volume PIMs.

scholarly journals Polymers of intrinsic microporosity as high temperature templates for the formation of nanofibrous oxides

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 73323-73326 ◽  
Author(s):  
H. Al Kutubi ◽  
L. Rassaei ◽  
W. Olthuis ◽  
G. W. Nelson ◽  
J. S. Foord ◽  
...  
Keyword(s):  
High Temperature ◽  
Metal Oxides ◽  
Rigid Polymers ◽  
Polymers Of Intrinsic Microporosity ◽  
Intrinsic Microporosity

Highly rigid polymers of intrinsic microporosity (PIM) offer novel high temperature template materials for the formation of nano-structured metal oxides, here for nanostructured Pr6O11.

scholarly journals Temperature Dependence of Gas Permeation and Diffusion in Triptycene-Based Ultrapermeable Polymers of Intrinsic Microporosity

2018 ◽  
Vol 10 (42) ◽  
pp. 36475-36482 ◽  
Author(s):  
Alessio Fuoco ◽  
Bibiana Comesaña-Gándara ◽  
Mariagiulia Longo ◽  
Elisa Esposito ◽  
Marcello Monteleone ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Gas Permeation ◽  
Polymers Of Intrinsic Microporosity ◽  
Intrinsic Microporosity ◽  
And Diffusion

scholarly journals Thermal Cross Linking of Novel Azide Modified Polymers of Intrinsic Microporosity—Effect of Distribution and the Gas Separation Performance

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1241 ◽  
Author(s):  
Silvio Neumann ◽  
Gisela Bengtson ◽  
David Meis ◽  
Volkan Filiz
Keyword(s):  
Gas Separation ◽  
Physical Aging ◽  
Gas Permeability ◽  
Time Lag ◽  
Polymer Chains ◽  
Separation Performance ◽  
Polymer Backbone ◽  
Cross Linkage ◽  
Polymers Of Intrinsic Microporosity ◽  
Intrinsic Microporosity

The synthesis of polymers of intrinsic microporosity (PIM) modified with azide groups, the cross linkage by nitrene reaction and their performance as gas separation membranes are reported. The azide modification of the spirobisindane units in the polymer backbone was done by post functionalization of methylated spirobisindane containing polymers. These polymers differ in distribution and concentration of the azide group containing spirobisindane units by applying perfectly alternating and randomly distributed copolymers along the polymer chains. To investigate the influence of concentration of the azide groups, additionally the homopolymer of methylated spirobisindane was synthesized and subjected to identical treatments and characterizations as both copolymers. Cross linkage by nitrene reaction was examined by different temperature treatments at 150, 200, 250 and 300 °C. Characterization of the new polymers was performed by NMR, SEC and FT-IR. Furthermore, the crosslinking process was investigated by means of solid state NMR, TGA-FTIR, DSC and isoconversional kinetic analysis performed with TGA. Gas permeability of CO2, N2, CH4, H2 and O2 was determined by time lag experiments and ideal selectivities for several gas pairs were calculated. The two azide groups per repeating unit degrade during thermal treatments by release of nitrogen and form mechanically stable PIM networks, leading to an increase in gas permeability while selectivity remained nearly constant. Measured diffusivity and solubility coefficients revealed differences in the formation of free volume elements depending on distribution and concentration of the azide groups. Aging studies over about five months were performed and physical aging rates (βP) were evaluated with regard to the concentration and distribution of curable azide functionalities. Subsequently, the enhanced sieving effect during aging resulted in membrane materials that surpassed the Robeson upper bound in selected gas pairs.

Physical aging of polymers of intrinsic microporosity: a SAXS/WAXS study

2014 ◽  
Vol 2 (30) ◽  
pp. 11742-11752 ◽  
Author(s):  
Amanda G. McDermott ◽  
Peter M. Budd ◽  
Neil B. McKeown ◽  
Coray M. Colina ◽  
James Runt
Keyword(s):  
Film Thickness ◽  
Free Volume ◽  
Physical Aging ◽  
Gas Separations ◽  
X Ray ◽  
Membrane Performance ◽  
X Ray Scattering ◽  
Polymeric Glasses ◽  
Polymers Of Intrinsic Microporosity ◽  
Intrinsic Microporosity

X-ray scattering patterns from these high free-volume polymeric glasses contain a feature strongly associated with porosity; it is sensitive to time, temperature and film thickness in a manner consistent with physical aging, which impacts membrane performance in gas separations.

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